{
  "studyId": "frost-lsoa-deciles-v1",
  "noteVersion": "1.0.0",
  "createdAtUtc": "2026-10-11T06:26:17.296059+00:00",
  "status": "Region labels resolved from an exact official 2023 code lookup; current-authority screening geography remains unresolved",
  "issue": "The frozen LSOA2021-to-UTLA2023 lookup uses legacy Barnsley and Sheffield codes; the inherited current-highway-authority context uses post-boundary-change codes.",
  "affectedLookupRows": 491,
  "affectedLookupRowCounts": {
    "E08000016": 148,
    "E08000019": 343
  },
  "rowCountInterpretation": "These 491 LSOAs reference the two legacy authority codes. This is not a claim that 491 LSOAs were physically transferred.",
  "regionMetadataByUtla23": {
    "E08000016": {
      "authorityName": "Barnsley",
      "regionId": "E12000003",
      "region": "Yorkshire and The Humber",
      "regionVintage": 2023,
      "sourceId": "ons-lad23-region23",
      "use": "Region metadata only; preserve the original UTLA23 code"
    },
    "E08000019": {
      "authorityName": "Sheffield",
      "regionId": "E12000003",
      "region": "Yorkshire and The Humber",
      "regionVintage": 2023,
      "sourceId": "ons-lad23-region23",
      "use": "Region metadata only; preserve the original UTLA23 code"
    }
  },
  "verifiedOfficialRegionRows": [
    {
      "LAD23CD": "E08000016",
      "LAD23NM": "Barnsley",
      "RGN23CD": "E12000003",
      "RGN23NM": "Yorkshire and The Humber"
    },
    {
      "LAD23CD": "E08000019",
      "LAD23NM": "Sheffield",
      "RGN23CD": "E12000003",
      "RGN23NM": "Yorkshire and The Humber"
    }
  ],
  "codeContinuityReferences": [
    {
      "name": "Barnsley",
      "legacyCode": "E08000016",
      "currentContextCode": "E08000038",
      "legacyLookupLsoaCount": 148,
      "sourceId": "ons-code-change",
      "geographicIdentityAssumed": false,
      "automaticRecodePermitted": false
    },
    {
      "name": "Sheffield",
      "legacyCode": "E08000019",
      "currentContextCode": "E08000039",
      "legacyLookupLsoaCount": 343,
      "sourceId": "ons-code-change",
      "geographicIdentityAssumed": false,
      "automaticRecodePermitted": false
    }
  ],
  "boundaryChange": {
    "instrument": "The Barnsley and Sheffield (Boundary Change) Order 2024",
    "instrumentId": "uksi/2024/1328",
    "madeDate": "2024-12-12",
    "territorialTransferDate": "2025-04-01",
    "articles8And9Commencement": "2024-12-13",
    "sourceId": "boundary-order",
    "relevantArticles": [
      1,
      2,
      3
    ],
    "transferor": "Barnsley Metropolitan Borough Council",
    "transferee": "Sheffield City Council",
    "areaDescription": "The mapped area of the Oughtibridge Mill / Oughtibridge Valley housing development on the east bank of the River Don moved from Barnsley to Sheffield.",
    "areaDescriptionSourceId": "barnsley-boundary",
    "wardTransfer": {
      "from": "Penistone East",
      "to": "Stocksbridge and Upper Don"
    },
    "parishTransfer": {
      "from": "Wortley parish",
      "to": "Wharncliffe Side ward of Bradfield parish"
    },
    "preciseTransferPolygonDigitisedForThisStudy": false
  },
  "dateInterpretation": "The Order is dated 2024 but its territorial transfer takes effect on 1 April 2025. The ONS indicator note describes changes in 2024; it is used here to verify code continuity, while the legal instrument supplies the effective geography date. The indicator-specific smoking comparability statement is not adopted as evidence that road mileage and collision geography are interchangeable.",
  "studyDecision": {
    "retainAll491LsoaRows": true,
    "retainOriginalUtla23Codes": true,
    "allowExactRegionMetadataSupplement": true,
    "changeNationalDecileReferencePopulationBecauseOfThisIssue": false,
    "successorCodeOrNameBasedAuthorityJoinAllowed": false,
    "originalAuthorityBasePanelChanged": false,
    "frozenProtocolChanged": false,
    "screeningStatusForCurrentCodes": [
      "E08000038",
      "E08000039"
    ],
    "screeningAction": "Withhold authority frost screening for these current codes until climate/road geometry and collision/mileage geography have a validated common boundary basis. Retain the base observations and original counts; do not silently drop source LSOAs.",
    "lsoaInventoryAction": "Keep spatially assigned LSOA counts and the frozen legacy authority label. A difference from the recorded current highway authority is a geography-vintage flag, not by itself proof of a bad collision position.",
    "whyNotNewBestFitLookup": "A newer centroid or best-fit LSOA-to-authority lookup may still assign a whole unchanged LSOA across a newly split authority boundary. That can support approximate labels but does not prove exact road-length, collision and mileage alignment.",
    "futureResolution": "Obtain a compatible current-authority boundary or precise transfer polygon; overlay the road/climate measure on that geography and verify the DfT numerator and mileage geography. Keep such work versioned and separate from this frozen lookup."
  },
  "inheritedInputs": {
    "lsoa21Utla23Lookup": {
      "url": "https://open-geography-portalx-ons.hub.arcgis.com/api/download/v1/items/1c727fa44989421dbe2dff1a9f5fb25e/csv?layers=0",
      "archivePath": "/social-factors-evidence/ed9df54f94c0c21f4a2b7e637e418d131a2230abc14ddaa048a28f37bf44f976.csv.gz",
      "rawSha256": "ed9df54f94c0c21f4a2b7e637e418d131a2230abc14ddaa048a28f37bf44f976",
      "gzipSha256": "7675ffff3aa43a68884e8762af2bb76929a668b50eb180f7aaa231a781f6b9a7",
      "hashesVerified": true
    },
    "authorityContext": {
      "path": "public/research/parking/v3/inputs/authority-context.json",
      "sha256": "b8b58e796df4a0e450dc00d9180e68a9cc77d36c3bd53d2d4360a4ccbf6fa9ac",
      "matchingCurrentRows": [
        {
          "id": "E08000038",
          "name": "Barnsley",
          "region": "Yorkshire and The Humber",
          "regionId": "E12000003",
          "centroid": [
            -1.549259,
            53.52578
          ]
        },
        {
          "id": "E08000039",
          "name": "Sheffield",
          "region": "Yorkshire and The Humber",
          "regionId": "E12000003",
          "centroid": [
            -1.542548,
            53.40359
          ]
        }
      ]
    },
    "unchangedProtocolSha256": "48097c23fe5946fb9f46d120e552c3fc64948defa5e743e09623b0d9da04917b",
    "unchangedAuthorityBasePanelSha256": "14e2e34342d042be1bd20d2789e1aa468c899a6f86b20dd6af37eb91a4739e9c"
  },
  "sources": [
    {
      "id": "ons-lad23-region23",
      "publisher": "Office for National Statistics",
      "title": "Local Authority District to Region (April 2023) Lookup in England",
      "url": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/LAD23_RGN23_EN_LU/FeatureServer/0/query?where=LAD23CD+IN+%28%27E08000016%27%2C%27E08000019%27%29&outFields=LAD23CD%2CLAD23NM%2CRGN23CD%2CRGN23NM&returnGeometry=false&orderByFields=LAD23CD&f=json",
      "resolvedUrl": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/LAD23_RGN23_EN_LU/FeatureServer/0/query?where=LAD23CD+IN+%28%27E08000016%27%2C%27E08000019%27%29&outFields=LAD23CD%2CLAD23NM%2CRGN23CD%2CRGN23NM&returnGeometry=false&orderByFields=LAD23CD&f=json",
      "retrievedAtUtc": "2026-10-11T06:24:22.436529+00:00",
      "rawSha256": "ac074a4421237641dc8bc640637bd5140866a5b0b11f3e5854d196bba8432075",
      "bytes": 948,
      "contentType": "application/json; charset=utf-8",
      "verified": true,
      "purpose": "Exact old-code-to-region records; the service is linked from the ONS-published national data catalogue entry."
    },
    {
      "id": "ons-code-change",
      "publisher": "Office for National Statistics",
      "title": "Explore Local Statistics: Cigarette smokers, geography note",
      "url": "https://www.ons.gov.uk/explore-local-statistics/indicators/cigarette-smokers",
      "resolvedUrl": "https://www.ons.gov.uk/explore-local-statistics/indicators/cigarette-smokers",
      "retrievedAtUtc": "2026-10-11T06:24:19.522623+00:00",
      "rawSha256": "2ceff050dbcae0c5d1c37ec7b811da4d8aabd5d8726f65fa57005db90310e06e",
      "bytes": 175783,
      "contentType": "text/html",
      "verified": true,
      "purpose": "Explicitly documents Barnsley and Sheffield old/new GSS codes; no smoking finding is used."
    },
    {
      "id": "boundary-order",
      "publisher": "UK legislation / The National Archives",
      "title": "The Barnsley and Sheffield (Boundary Change) Order 2024",
      "url": "https://www.legislation.gov.uk/uksi/2024/1328/data.xml",
      "resolvedUrl": "https://www.legislation.gov.uk/uksi/2024/1328/made/data.xml",
      "retrievedAtUtc": "2026-10-11T06:24:27.880233+00:00",
      "rawSha256": "df382e2dd358421d892ee0813003ace30d60588bd3df5309161ec6086180aacf",
      "bytes": 44955,
      "contentType": "application/xml;charset=utf-8",
      "verified": true,
      "purpose": "Articles 1–3 verify commencement, territory, wards and parishes; original XML successfully fetched and parsed."
    },
    {
      "id": "barnsley-boundary",
      "publisher": "Barnsley Metropolitan Borough Council",
      "title": "Barnsley's Local Plan: Barnsley/Sheffield boundary change",
      "url": "https://www.barnsley.gov.uk/services/planning-and-buildings/planning-policy-and-local-plan/barnsleys-local-plan/",
      "resolvedUrl": "https://www.barnsley.gov.uk/services/planning-and-buildings/planning-policy-and-local-plan/barnsleys-local-plan/",
      "retrievedAtUtc": "2026-10-11T06:24:21.432928+00:00",
      "rawSha256": "6ff2ee29009287e98e7bc50a4f21843cc88b90847313d34260523e7e3ca43769",
      "bytes": 71377,
      "contentType": "text/html; charset=utf-8",
      "verified": true,
      "purpose": "Confirms the 1 April 2025 transfer and identifies the development/east bank of the River Don."
    }
  ],
  "sourceDiscovery": {
    "onsRegionCatalogue": "https://www.data.gov.uk/dataset/2ffb3480-d10a-4717-b534-10a7621962eb/local-authority-district-to-region-april-2023-lookup-in-en",
    "onsRegionService": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/LAD23_RGN23_EN_LU/FeatureServer/0"
  },
  "checks": {
    "allFourPublicSourcesDownloadedAndHashed": true,
    "officialRegionResultExactlyTwoRequestedCodes": true,
    "bothCodesExplicitlyMapToE12000003": true,
    "oldLookupRowsRecountedAs148And343": true,
    "legacyCodesAbsentFrom153AuthorityContext": true,
    "successorCodesPresentInContext": true,
    "legalEffectiveDateAndWardParishTransfersVerified": true,
    "protocolAndBasePanelHashesUnchanged": true
  }
}