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Retrospective research only until the forecast-origin audit passes."},{"id":"age65_plus","label":"Residents aged 65+","family":"Baseline controls","source":"ts007a","numerator":[17,18,19,20,21],"denominator":[3],"unit":"%","role":"control","note":"","status":"complete","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2021-03-21","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","numeratorColumns":[{"column":"Age: Aged 65 to 69 years","weight":1},{"column":"Age: Aged 70 to 74 years","weight":1},{"column":"Age: Aged 75 to 79 years","weight":1},{"column":"Age: Aged 80 to 84 years","weight":1},{"column":"Age: Aged 85 years and over","weight":1}],"denominatorColumns":["Age: Total"],"releasedAt":null,"sourceUrl":"https://www.nomisweb.co.uk/output/census/2021/census2021-ts007a.zip","validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"100 × (Age: Aged 65 to 69 years + Age: Aged 70 to 74 years + Age: Aged 75 to 79 years + Age: Aged 80 to 84 years + Age: Aged 85 years and over) / (Age: Total)","denominatorDefinition":"Age: Total","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"age0_14","label":"Residents aged 0–14","family":"Baseline controls","source":"ts007a","numerator":[4,5,6],"denominator":[3],"unit":"%","role":"control","note":"","status":"complete","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2021-03-21","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","numeratorColumns":[{"column":"Age: Aged 4 years and under","weight":1},{"column":"Age: Aged 5 to 9 years","weight":1},{"column":"Age: Aged 10 to 14 years","weight":1}],"denominatorColumns":["Age: Total"],"releasedAt":null,"sourceUrl":"https://www.nomisweb.co.uk/output/census/2021/census2021-ts007a.zip","validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"100 × (Age: Aged 4 years and under + Age: Aged 5 to 9 years + Age: Aged 10 to 14 years) / (Age: Total)","denominatorDefinition":"Age: Total","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"motorway_share","label":"Motorway share of mapped road length","family":"Road layout","source":"os-roads","numerator":["motorwayMetres"],"denominator":["roadMetres"],"unit":"%","role":"control","note":"Zero group plus positive-value deciles. Physical road length, not mileage.","status":"complete","zeroBand":true,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Zero + positive deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"100 × motorwayMetres / roadMetres","denominatorDefinition":"Mapped non-fictitious OS roadMetres, including restricted/private roads; converted to km for node densities.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"a_road_share","label":"A-road share of mapped road length","family":"Road layout","source":"os-roads","numerator":["aRoadMetres"],"denominator":["roadMetres"],"unit":"%","role":"control","note":"Zero group plus positive-value deciles. OS function field.","status":"complete","zeroBand":true,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Zero + positive deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"100 × aRoadMetres / roadMetres","denominatorDefinition":"Mapped non-fictitious OS roadMetres, including restricted/private roads; converted to km for node densities.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"minor_road_share","label":"Minor/local share of mapped road length","family":"Road layout","source":"os-roads","numerator":["minorMetres"],"denominator":["roadMetres"],"unit":"%","role":"control","note":"B, minor, local and access-road functions, including restricted access. Not traffic-weighted.","status":"complete","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"100 × minorMetres / roadMetres","denominatorDefinition":"Mapped non-fictitious OS roadMetres, including restricted/private roads; converted to km for node densities.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"junction_density","label":"Junctions per mapped road kilometre","family":"Road layout","source":"os-roads","numerator":["junctions"],"denominator":["roadMetres"],"unit":"junctions/km","role":"candidate","note":"OS junction nodes only. Pseudo nodes, road ends and roundabout nodes excluded.","status":"complete","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"1000 × junctions / roadMetres","denominatorDefinition":"Mapped non-fictitious OS roadMetres, including restricted/private roads; converted to km for node densities.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"roundabout_density","label":"Roundabout nodes per mapped road kilometre","family":"Road layout","source":"os-roads","numerator":["roundabouts"],"denominator":["roadMetres"],"unit":"nodes/km","role":"candidate","note":"OS roundabout node count; zero group plus positive-value deciles. Not a manually audited roundabout inventory.","status":"complete","zeroBand":true,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Zero + positive deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"1000 × roundabouts / roadMetres","denominatorDefinition":"Mapped non-fictitious OS roadMetres, including restricted/private roads; converted to km for node densities.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"road_sinuosity","label":"Mapped road sinuosity","family":"Road layout","source":"os-roads","numerator":["sinuosityWeightedMetres"],"denominator":["sinuosityEligibleMetres"],"unit":"ratio","role":"candidate","note":"Length-weighted full-link length/endpoint distance, excluding closed and roundabout links. Generalised geometry proxy; not bend radius.","status":"provisional","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"2026-04","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://api.os.uk/downloads/v1/products/OpenRoads/downloads?area=GB&format=ESRI%C2%AE+Shapefile&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","definition":"sinuosityWeightedMetres / sinuosityEligibleMetres","denominatorDefinition":"sinuosityEligibleMetres (eligible non-closed, non-roundabout links)","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated","provisional_source_or_measurement"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"air_frost_normal","label":"Road-weighted air-frost days","family":"Weather","source":"metoffice-frost","numerator":["frostWeightedMetres"],"denominator":["frostCoveredMetres"],"unit":"days/year","role":"candidate","note":"1991–2020 normal, public 2 km HadUK-Grid v1.1.0.0. At least 99% mapped road coverage. Not road ice or annual 2022–2025 weather.","status":"provisional","zeroBand":false,"comparability":"Common source and calculation across England and Wales","direction":"Higher band = higher feature value; collision-risk direction has not been tested","observationPeriod":"1991–2020","geographicResolution":"LSOA2021, England and Wales","licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","sourceUrl":"https://www.arcgis.com/home/item.html?id=4d5f49b8e0de4119a4579444aed5f6a0","releasedAt":null,"validCount":35365,"missingCount":307,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":35365,"bandsWithheld":false,"releaseDecision":"banded","definition":"frostWeightedMetres / frostCoveredMetres; at least 99% mapped-road coverage","denominatorDefinition":"Mapped road metres covered by the observed 2 km climate grid; >=99% coverage required.","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated","partial_coverage","provisional_source_or_measurement"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":"2026-10-12","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/road-source-register.json","readiness":"calculated research feature; prediction untested","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"claimant_rate","label":"Lagged Claimant Count rate, ages 16-64 (2021)","family":"Socio-demographic","source":"f3-source","numerator":[],"denominator":[],"definition":"100 * mean of the twelve 2021 monthly age16-64 Claimant Counts / mid-2021 residents aged 16-64","unit":"percent of residents aged 16-64","role":"candidate","note":"Retrospective lagged context, not an as-of-2022 forecast. Current revised 2020/2021 populations and historical claimant extracts. Only unchanged/exact-merge geographies are numeric; all master areas retained. Claimant count is an administrative benefit measure, not unemployment. Published source counts are rounded; no individual-level precision is implied. 1,906 LSOA2021 areas require split/complex disaggregation; the ONS exact-fit lookup provides correspondence, not claimant allocation weights. No independently validated within-parent claimant distribution is available. Centroid best-fit and population-proportional splits are not substituted for observed local counts. National and geographically stratified coverage fall short of the frozen F1 band-release thresholds. National or subgroup numeric-coverage gate failed. Source measurement/comparability gate unresolved.","status":"provisional","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"2021","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Acquired source; numeric diagnostics","sourceUrl":"https://www.nomisweb.co.uk/datasets/ucjsa","releasedAt":null,"validCount":33766,"missingCount":1906,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F3","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":true,"releaseDecision":"diagnostic_only","denominatorDefinition":"Year-matched ONS rebased mid-year residents aged 16-64 on LSOA2021; NM_2014_1, c_age=203, gender=0; same frozen edition for both years.","qualityFlags":["diagnostic_only","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f3-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"Derived source measure"},{"id":"claimant_change","label":"Annual Claimant Count rate change, ages 16-64 (2021 minus 2020)","family":"Socio-demographic","source":"f3-source","numerator":[],"denominator":[],"definition":"2021 annual mean claimant rate minus the comparable 2020 annual mean rate","unit":"percentage points","role":"candidate","note":"Retrospective lagged context, not an as-of-2022 forecast. Current revised 2020/2021 populations and historical claimant extracts. Only unchanged/exact-merge geographies are numeric; all master areas retained. Claimant count is an administrative benefit measure, not unemployment. Published source counts are rounded; no individual-level precision is implied. 1,906 LSOA2021 areas require split/complex disaggregation; the ONS exact-fit lookup provides correspondence, not claimant allocation weights. No independently validated within-parent claimant distribution is available. Centroid best-fit and population-proportional splits are not substituted for observed local counts. National and geographically stratified coverage fall short of the frozen F1 band-release thresholds. National or subgroup numeric-coverage gate failed. Source measurement/comparability gate unresolved.","status":"provisional","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"2020 and 2021","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Acquired source; numeric diagnostics","sourceUrl":"https://www.nomisweb.co.uk/datasets/ucjsa","releasedAt":null,"validCount":33766,"missingCount":1906,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F3","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":true,"releaseDecision":"diagnostic_only","denominatorDefinition":"Year-matched ONS rebased mid-year residents aged 16-64 on LSOA2021; NM_2014_1, c_age=203, gender=0; same frozen edition for both years.","qualityFlags":["diagnostic_only","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f3-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"Derived source measure"},{"id":"income_deprivation","label":"Harmonised income deprivation","family":"Socio-demographic","source":"https://www.gov.wales/welsh-index-multiple-deprivation-wimd-2025-guidance-html","numerator":[],"denominator":[],"definition":"Common benefit coverage / common population denominator","unit":"not yet frozen","role":"candidate","note":"English IMD and Welsh WIMD are not comparable. Benefit coverage, denominators and periods are unreconciled. Native ranks are not pooled.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"edition-specific","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://www.gov.wales/welsh-index-multiple-deprivation-wimd-2025-guidance-html","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: Common benefit coverage / common population denominator","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"employment_deprivation","label":"Harmonised employment deprivation","family":"Socio-demographic","source":"https://www.gov.uk/government/statistics/english-indices-of-deprivation-2025","numerator":[],"denominator":[],"definition":"Common eligible claimant count / common working-age denominator","unit":"not yet frozen","role":"candidate","note":"Country-specific constructions unreconciled. Census unemployment is retained as a separate measure, not a replacement deprivation index.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"edition-specific","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://www.gov.uk/government/statistics/english-indices-of-deprivation-2025","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: Common eligible claimant count / common working-age denominator","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"road_gradient","label":"Road-weighted terrain-gradient proxy","family":"Road layout","source":"f4-source","numerator":[],"denominator":[],"definition":"Length-weighted mean 100*absolute bilinear terrain elevation difference/along-road interval metres, sampled at50m with residual endpoints.","unit":"percent gradient","role":"candidate","note":"Numeric terrain-context diagnostics only. No proven road-surface grade; 50/100m and tagged-structure exclusion sensitivities are internal consistency checks. Independent road-surface grade validation absent, including bridges, tunnels, urban cuttings and upland minor roads. Structure tags do not establish complete bridge identification; untagged roads cannot be assumed to be ground-level. Source measurement/comparability gate unresolved.","status":"provisional","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"OS Terrain50 July2026; OS Open Roads April2026; retrospective geographic context","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Acquired source; numeric diagnostics","sourceUrl":"https://api.os.uk/downloads/v1/products/Terrain50/downloads?area=GB&format=ASCII+Grid+and+GML+%28Grid%29&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F4","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":0,"bandsWithheld":true,"releaseDecision":"diagnostic_only","denominatorDefinition":"Terrain-covered metres of all frozen non-fictitious OS road geometry; >=99% mapped-road coverage required per LSOA.","qualityFlags":["diagnostic_only","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f4-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"terrain proxy"},{"id":"steep_road_share","label":"Road-length share above 8% terrain-gradient proxy","family":"Road layout","source":"f4-source","numerator":[],"denominator":[],"definition":"100 * terrain-covered road metres with sampled gradient strictly above8% / terrain-covered road metres.","unit":"percent of terrain-covered road metres","role":"candidate","note":"Numeric terrain-context diagnostics only. No proven road-surface grade; 50/100m and tagged-structure exclusion sensitivities are internal consistency checks. Independent road-surface grade validation absent, including bridges, tunnels, urban cuttings and upland minor roads. Structure tags do not establish complete bridge identification; untagged roads cannot be assumed to be ground-level. Source measurement/comparability gate unresolved.","status":"provisional","zeroBand":true,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"OS Terrain50 July2026; OS Open Roads April2026; retrospective geographic context","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Acquired source; numeric diagnostics","sourceUrl":"https://api.os.uk/downloads/v1/products/Terrain50/downloads?area=GB&format=ASCII+Grid+and+GML+%28Grid%29&redirect","releasedAt":null,"validCount":35672,"missingCount":0,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F4","mileageAllocationUse":"Shared inputs with pilot exposure (population/road/rurality); sensitivity required","bandedCount":0,"bandsWithheld":true,"releaseDecision":"diagnostic_only","denominatorDefinition":"Terrain-covered metres of all frozen non-fictitious OS road geometry; >=99% mapped-road coverage required per LSOA.","qualityFlags":["diagnostic_only","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f4-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"terrain proxy"},{"id":"hgv_share","label":"HGV traffic share","family":"Traffic and activity","source":"https://roadtraffic.dft.gov.uk/downloads","numerator":[],"denominator":[],"definition":"HGV miles / all-motor miles","unit":"not yet frozen","role":"candidate","note":"National all-road LSOA vehicle-class allocation not validated. Existing major-road counts and regional mileage are insufficient.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"lagged annual","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://roadtraffic.dft.gov.uk/downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: HGV miles / all-motor miles","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"van_share","label":"Van traffic share","family":"Traffic and activity","source":"https://roadtraffic.dft.gov.uk/downloads","numerator":[],"denominator":[],"definition":"LGV miles / all-motor miles","unit":"not yet frozen","role":"candidate","note":"Same national all-road vehicle-mix gap; retain counted/estimated flags.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"lagged annual","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://roadtraffic.dft.gov.uk/downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: LGV miles / all-motor miles","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"motorcycle_share","label":"Motorcycle traffic share","family":"Traffic and activity","source":"https://roadtraffic.dft.gov.uk/downloads","numerator":[],"denominator":[],"definition":"Motorcycle miles / all-motor miles","unit":"not yet frozen","role":"candidate","note":"Same national all-road vehicle-mix gap; collision-involved vehicles must not supply this feature.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"lagged annual","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://roadtraffic.dft.gov.uk/downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: Motorcycle miles / all-motor miles","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"bus_share","label":"Bus and coach traffic share","family":"Traffic and activity","source":"https://roadtraffic.dft.gov.uk/downloads","numerator":[],"denominator":[],"definition":"Bus and coach miles / all-motor miles","unit":"not yet frozen","role":"candidate","note":"Same national all-road vehicle-mix gap.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"lagged annual","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://roadtraffic.dft.gov.uk/downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: Bus and coach miles / all-motor miles","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"flow_intensity","label":"Motor traffic intensity","family":"Traffic and activity","source":"https://roadtraffic.dft.gov.uk/downloads","numerator":[],"denominator":[],"definition":"Motor miles / mapped public-road length / days","unit":"not yet frozen","role":"candidate","note":"National all-road LSOA exposure remains a Phase 3 dependency. Physical OS road length is not a traffic estimate.","status":"deferred","zeroBand":false,"comparability":"Not established; combined decile withheld","observationPeriod":"lagged annual","direction":"Not assigned","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Candidate source identified; national extract not frozen","sourceUrl":"https://roadtraffic.dft.gov.uk/downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"No assignments","sourceVersion":"ew-v1","phase":"Original 1–2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":false,"releaseDecision":"deferred","denominatorDefinition":"Not frozen; proposed definition: Motor miles / mapped public-road length / days","qualityFlags":["deferred","retrospective_mixed_vintage","not_claims_validated","no_numeric_assignments"],"featureFreezeVersion":"ew-v4","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v1/source-register.json","readiness":"deferred source/definition gate","historicalForecastEligibility":"Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes."},{"id":"school_density","label":"School site density near roads","family":"Traffic and activity","source":"f2-source","numerator":[],"denominator":[],"definition":"Count of eligible unique physical sites in the LSOA within100m of eligible roads / eligible road km in the LSOA.","unit":"sites per eligible road km","role":"candidate","note":"Retrospective spatial context; no2022 as-of eligibility. National bands require separate F6 coverage and missing-rank gates. 87 eligible English establishments lack source coordinates Welsh independent register has 78 entries; only 45 have matching GIAS coordinates and primary/secondary age scope is unresolved Conflicting school UPRN coordinates require review National or subgroup numeric-coverage gate failed. Missing-value rank sensitivity failed or no numeric values. Source measurement/comparability gate unresolved.","status":"deferred","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"2026-10-13 GIAS/NaPTAN snapshots; Welsh school register2026-04-23; roadsApril2026","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Unresolved source gate","sourceUrl":"https://www.get-information-schools.service.gov.uk/Downloads","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":true,"releaseDecision":"deferred","denominatorDefinition":"Non-fictitious OS road functions Motorway,A Road,B Road,Minor Road,Local Road,Local Access Road. Public-use proxy: function classes do not certify legal access. Restricted Local Access Road and Secondary Access Road excluded.","qualityFlags":["deferred","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f2-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"Derived source measure"},{"id":"stop_density","label":"Public transport access-site density near roads","family":"Traffic and activity","source":"f2-source","numerator":[],"denominator":[],"definition":"Count of eligible unique physical sites in the LSOA within100m of eligible roads / eligible road km in the LSOA.","unit":"sites per eligible road km","role":"candidate","note":"Retrospective spatial context; no2022 as-of eligibility. National bands require separate F6 coverage and missing-rank gates.","status":"provisional","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"2026-10-13 GIAS/NaPTAN snapshots; Welsh school register2026-04-23; roadsApril2026","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"Acquired and checked","sourceUrl":"https://naptan.api.dft.gov.uk/v1/access-nodes?dataFormat=csv","releasedAt":null,"validCount":35646,"missingCount":26,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-f6-v1","phase":"F2","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":35646,"bandsWithheld":false,"releaseDecision":"banded","denominatorDefinition":"Non-fictitious OS road functions Motorway,A Road,B Road,Minor Road,Local Road,Local Access Road. Public-use proxy: function classes do not certify legal access. Restricted Local Access Road and Secondary Access Road excluded.","qualityFlags":["banded","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":"2026-10-13T08:44:00.646694+00:00","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f2-audit.json","readiness":"Ready for F7 collision screening; not yet tested","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"Derived source measure"},{"id":"snow_lying","label":"Road-weighted snow-lying days","family":"Weather","source":"f5-source","numerator":[],"denominator":[],"definition":"Publisher annual mean count of days with >50% ground covered by snow at 0900 UTC; 1991-2020","unit":"days/year","role":"candidate","note":"HadUK station-interpolated climate estimate, road-length weighted. Exact source threshold and 1991-2020 period preserved; missing road coverage remains unavailable. Higher value is more weather exposure, not established collision risk. Exact authorised CEDA inputs not acquired; registered-user authentication required. New 1km road/grid intersections required before optional NetCDF grid outputs can enter LSOA lookup. National or subgroup numeric-coverage gate failed. Missing-value rank sensitivity failed or no numeric values. Source measurement/comparability gate unresolved.","status":"deferred","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"1991-2020","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"blocked_source_access","sourceUrl":"https://catalogue.ceda.ac.uk/uuid/789b3065d74a4c948ab05d33556c86d0/","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F5","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":true,"releaseDecision":"deferred","denominatorDefinition":"Covered mapped road metres; >=99% of all frozen mapped physical road length per LSOA required. Climate counts per year; rainfall intensity per wet day >=1mm within grid before road weighting.","qualityFlags":["deferred","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f5-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"unavailable"},{"id":"heavy_rain","label":"Road-weighted heavy-rain days","family":"Weather","source":"f5-source","numerator":[],"denominator":[],"definition":"Annual count rainfall >=10mm; 1991-2020 mean","unit":"days/year","role":"candidate","note":"HadUK station-interpolated climate estimate, road-length weighted. Exact source threshold and 1991-2020 period preserved; missing road coverage remains unavailable. Higher value is more weather exposure, not established collision risk. 307 LSOAs fail the 99% road-coverage requirement and remain unavailable. Exact source and geometry gates passed; F6 national missing-rank sensitivity and concentrated-missingness review pending.","status":"provisional","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"1991-2020","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"acquired_exact_publisher_normal","sourceUrl":"https://services.arcgis.com/Lq3V5RFuTBC9I7kv/arcgis/rest/services/Annual_Count_of_10mm_Rain_Days_1991_2020/FeatureServer/0","releasedAt":null,"validCount":35365,"missingCount":307,"bandScheme":"Combined E&W deciles","sourceVersion":"ew-f6-v1","phase":"F5","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":35365,"bandsWithheld":false,"releaseDecision":"banded","denominatorDefinition":"Covered mapped road metres; >=99% of all frozen mapped physical road length per LSOA required. Climate counts per year; rainfall intensity per wet day >=1mm within grid before road weighting.","qualityFlags":["banded","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":"2026-10-13T08:44:00.646694+00:00","historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f5-audit.json","readiness":"Ready for F7 collision screening; not yet tested","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"estimated_grid_normal"},{"id":"rain_intensity","label":"Road-weighted wet-day rainfall intensity","family":"Weather","source":"f5-source","numerator":[],"denominator":[],"definition":"Sum rainfall on days >=1mm / number of days >=1mm, pooled over 1991-2020 within grid; then road weighted","unit":"mm/wet day","role":"candidate","note":"HadUK station-interpolated climate estimate, road-length weighted. Exact source threshold and 1991-2020 period preserved; missing road coverage remains unavailable. Higher value is more weather exposure, not established collision risk. Exact authorised CEDA inputs not acquired; registered-user authentication required. New 1km road/grid intersections required before optional NetCDF grid outputs can enter LSOA lookup. National or subgroup numeric-coverage gate failed. Missing-value rank sensitivity failed or no numeric values. Source measurement/comparability gate unresolved.","status":"deferred","zeroBand":false,"comparability":"See source audit and F6 gate decisions; fixed common definition with explicit limitations.","observationPeriod":"1991-2020","direction":"Higher band means higher feature value; collision-risk direction is untested.","geographicResolution":"LSOA2021, England and Wales","licence":"Expected public-data licence; exact extract terms not yet verified","sourceStatus":"blocked_source_access","sourceUrl":"https://catalogue.ceda.ac.uk/uuid/789b3065d74a4c948ab05d33556c86d0/","releasedAt":null,"validCount":0,"missingCount":35672,"bandScheme":"National bands withheld","sourceVersion":"ew-f6-v1","phase":"F5","mileageAllocationUse":"No direct use identified in current pilot; nationwide allocation audit pending","bandedCount":0,"bandsWithheld":true,"releaseDecision":"deferred","denominatorDefinition":"Covered mapped road metres; >=99% of all frozen mapped physical road length per LSOA required. Climate counts per year; rainfall intensity per wet day >=1mm within grid before road weighting.","qualityFlags":["deferred","not_collision_tested_in_F7","not_claims_validated","retrospective_source_vintage"],"featureFreezeVersion":"ew-f6-v1","frozenBandsAvailableFrom":null,"historicalAsOf2022Eligible":false,"claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/f6-v1/f5-audit.json","readiness":"National bands withheld pending recorded gates","historicalForecastEligibility":"This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.","measurementType":"unavailable"},{"id":"multi_car","label":"Households with 2+ cars or vans","family":"Housing and vehicles","source":"ts045","numerator":[6,7],"denominator":[3],"unit":"%","definition":"100 × sum(numerator categories) / sum(denominator categories)","role":"candidate","note":"Includes top-coded 3+ households. Availability, not miles driven.","status":"complete","readiness":"baseline context","measurementType":"Census count-derived share","observationPeriod":"2021-03-21","overlapGroup":"vehicle availability","phase":"E2","zeroBand":false,"sourceVersion":"ew-v2","direction":"Higher band = higher feature value; no tested collision-risk direction","sourceGeography":"LSOA2021","geographicResolution":"LSOA2021, England and Wales","applicability":"All 35,672 master LSOAs; missing denominators remain unavailable","comparability":"Common national source, categories and mode definition","retrospectiveResearchAvailable":true,"historicalForecastEligibility":"Source release is a lower bound only. Exact archived edition and national band construction must be evidenced at the forecast origin.","historicalAsOf2022Eligible":false,"availableFrom":"2023-01-06","frozenBandsAvailableFrom":"2026-10-12","mileageAllocationUse":"Not used by the current regional pilot; future nationwide allocation not audited","exposureSensitivityRequired":true,"licence":"Open Government Licence v3.0","sourceStatus":"Frozen archived input","releasedAt":"2023-01-06T00:00:00.000Z","extractedAt":"2026-10-12","revision":"2","sourceChecksums":[{"file":"inputs/ts045-lsoa.csv.gz","sha256":"19c088c0d81fdbf19c36d89a8ea8c6acb02a85a1ec3f4481f9eb62a58955b2e1","bytes":506370},{"file":"inputs/ts045-metadata.txt","sha256":"1c0b62c2a8c460d493c993773c0fd08199cda98d46465cf5d0a9d8bc5c0972a5","bytes":4667}],"coverageStatus":"complete","sourceUrl":"https://www.nomisweb.co.uk/output/census/2021/census2021-ts045.zip","numeratorColumns":[{"column":"Number of cars or vans: 2 cars or vans in household","weight":1},{"column":"Number of cars or vans: 3 or more cars or vans in household","weight":1}],"denominatorColumns":["Number of cars or vans: Total: All households"],"denominatorDefinition":"Number of cars or vans: Total: All households","validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated"],"featureFreezeVersion":"ew-v4","claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v2/source-register.json"},{"id":"three_plus_car","label":"Households with 3+ cars or vans","family":"Housing and vehicles","source":"ts045","numerator":[7],"denominator":[3],"unit":"%","definition":"100 × sum(numerator categories) / sum(denominator categories)","role":"candidate","note":"Top-coded 3+ category retained; nested within multi-car households.","status":"complete","readiness":"baseline context","measurementType":"Census count-derived share","observationPeriod":"2021-03-21","overlapGroup":"vehicle availability","phase":"E2","zeroBand":false,"sourceVersion":"ew-v2","direction":"Higher band = higher feature value; no tested collision-risk direction","sourceGeography":"LSOA2021","geographicResolution":"LSOA2021, England and Wales","applicability":"All 35,672 master LSOAs; missing denominators remain unavailable","comparability":"Common national source, categories and mode definition","retrospectiveResearchAvailable":true,"historicalForecastEligibility":"Source release is a lower bound only. 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National LSOA-weighted ties remain together; authority-weighted sensitivity is supplied.","status":"provisional","readiness":"provisional inherited authority context","measurementType":"Inherited local-authority context","role":"candidate","zeroBand":false,"overlapGroup":"Financial context","sourceVersion":"ew-v3","direction":"Higher band = higher feature value; no tested collision-risk direction","sourceGeography":"Official LAD2025 reporting area inherited to LSOA2021","geographicResolution":"Local-authority reporting area inherited to LSOA2021","applicability":"Every one of the 35,672 master LSOAs retained. Coverage gates are feature-specific; source gaps are not zero.","comparability":"Common source and definition across England and Wales; feature-specific coverage and vintage limitations retained","retrospectiveResearchAvailable":true,"historicalForecastEligibility":"Retrospective source editions and bands frozen on 2026-10-12. No certified historical as-of score. Use only sources and bands known at a future forecast origin.","historicalAsOf2022Eligible":false,"availableFrom":"2026-03-27","frozenBandsAvailableFrom":"2026-10-12","mileageAllocationUse":"Not used in the existing regional mileage pilot. Nationwide exposure dependence still requires audit.","exposureSensitivityRequired":true,"licence":"Open Government Licence v3.0; source-specific attribution in audits.","sourceStatus":"Frozen source-derived aggregate","releasedAt":"2026-03-27","extractedAt":"2026-10-12","revision":"Pinned source edition; retrieved 2026-10-12, see source audit","sourceChecksums":[{"file":"inputs/insolvency-acquisition.json","sha256":"509885076cb9fe8c41ef20f9c6fb133ca2d07d7719a13966aa7ded57bab7dded"},{"file":"inputs/insolvency-authority-sensitivity.csv.gz","sha256":"002fcbfd851d8819eebcb39e3371a5fab7f8bc6a5c33166b97aca21485cacce4"},{"file":"inputs/insolvency-authority-year.csv.gz","sha256":"6791eeafba4b295c0b2bc3d5ac897cf8918b09a7f2d114ae973a316c5c8a2c9e"},{"file":"inputs/insolvency-location-2025.xlsx","sha256":"f70fa64e30e94b5e8687812497a65c3c888e2f6b61ba9d0bdabf19467c186b39"},{"file":"inputs/insolvency-lookup-metadata.json","sha256":"c2379daa2ca17a86615c76274b80b7887487ea28ae3295f761e0e8a93f796304"},{"file":"inputs/insolvency-lookup-response.json.gz","sha256":"f596c73d6b630b1390a07d419ca8e69028a63f208bdefec079a1736fb3d13772"},{"file":"inputs/insolvency-lsoa-lad.csv.gz","sha256":"b2ebde69ba8195bcc811acbf9b03d900b1e1f1dec25c4fb85549b73ee94ef636"},{"file":"inputs/insolvency-lsoa-values.csv.gz","sha256":"d82b7642d85b64d3edf4d6fc9958dab5a89e8b337fe25f45c59ee5d6619e6313"}],"coverageStatus":"complete","validCount":35672,"missingCount":0,"bandScheme":"Combined E&W deciles, eligible observed source values","bandedCount":35672,"bandsWithheld":false,"releaseDecision":"banded","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated","provisional_source_or_measurement","inherited_authority_context","provisional_adult_denominator"],"featureFreezeVersion":"ew-v4","claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v3/source-register.json"},{"id":"heat_summer_days_gt25","label":"Road-weighted summer days >25°C","phase":"E4","family":"Weather","unit":"days/year","definition":"sum(road metres × grid mean annual days with Tmax >25°C) / covered road metres","denominatorDefinition":"Covered mapped road metres","numerator":[],"denominator":[],"source":"Met Office observed summer-days 2 km grid","sourceUrl":"https://www.arcgis.com/home/item.html?id=439d540451ca46ad892a0a2c72b29ce9","observationPeriod":"1991–2020 climate normal","note":"Observed 1991–2020 mean annual days strictly >25°C, road-weighted using April 2026 mapped roads; ≥99% road coverage. This is not the planned ≥25°C threshold or annual post-pandemic heat. Public HadUK-Grid v1.1.0.0; geometry matched all 63,296 frozen frost-grid cells.","status":"provisional","readiness":"provisional supporting climate normal","measurementType":"Observed gridded climate normal","role":"supporting candidate","zeroBand":false,"overlapGroup":"Weather","sourceVersion":"ew-v3","direction":"Higher band = higher feature value; no tested collision-risk direction","sourceGeography":"2 km OSGB grid to LSOA2021 roads","geographicResolution":"LSOA2021 aggregate; source resolution retained in audit","applicability":"Every one of the 35,672 master LSOAs retained. Coverage gates are feature-specific; source gaps are not zero.","comparability":"Common source and definition across England and Wales; feature-specific coverage and vintage limitations retained","retrospectiveResearchAvailable":true,"historicalForecastEligibility":"Retrospective source editions and bands frozen on 2026-10-12. No certified historical as-of score. Use only sources and bands known at a future forecast origin.","historicalAsOf2022Eligible":false,"availableFrom":"2022-03-15","frozenBandsAvailableFrom":"2026-10-12","mileageAllocationUse":"Not used in the existing regional mileage pilot. Nationwide exposure dependence still requires audit.","exposureSensitivityRequired":true,"licence":"Open Government Licence v3.0; source-specific attribution in audits.","sourceStatus":"Frozen source-derived aggregate","releasedAt":"2022-03-15","extractedAt":"2026-10-12","revision":"Pinned source edition; retrieved 2026-10-12, see source audit","sourceChecksums":[{"file":"inputs/heat-frost-grid-crosswalk.csv.gz","sha256":"af3c4ba5c794eb458fd8d99139b84c2a97145502a411da3de5e72c0ad759b8ef"},{"file":"inputs/heat-lsoa.csv.gz","sha256":"47010d66a829f5afe5af151eeb6d0905ee3dd93b07ad6b23ea740a6705d9e2ce"},{"file":"inputs/heat-summer-days-gt25-grid.json.gz","sha256":"c2db3ea1d044a82c155e8d1f87ddea3924393e9d605b81ace588cfd5b39d73bb"}],"coverageStatus":"partial","validCount":35365,"missingCount":307,"bandScheme":"Combined E&W deciles, eligible observed source values","bandedCount":35365,"bandsWithheld":false,"releaseDecision":"banded","qualityFlags":["banded","retrospective_mixed_vintage","not_claims_validated","partial_coverage","provisional_source_or_measurement"],"featureFreezeVersion":"ew-v4","claimsValidation":false,"predictiveValidation":false,"sourceRegisterUrl":"/research/ew-deciles/v3/source-register.json"}]}