{
  "schemaVersion": 2,
  "briefingId": "UI-BRF-2026-10-12",
  "title": "UK Property Evidence Briefing",
  "releaseDate": "2026-10-12",
  "publishedAt": "2026-10-12T13:03:50.875Z",
  "geography": "United Kingdom",
  "analyticalUnit": "Release-to-release change in aggregate current record representations, interpreted alongside collection completion and official long-let measures.",
  "release": {
    "releaseId": "UI-OBS-UK-2026-10-12",
    "methodVersion": "complete-active-register-v3",
    "baselineReleaseId": "UI-OBS-UK-2026-09-30",
    "baselineDate": "2026-09-30",
    "currentDate": "2026-10-12",
    "intervalDays": 12
  },
  "maturity": {
    "releaseCount": 4,
    "minimumTrendReleases": 6,
    "stage": "early-series",
    "trendReady": false,
    "statement": "4 approved releases support comparison, not a market trend claim."
  },
  "national": {
    "mappedRecords": 626117,
    "mappedRecordDelta": 74109,
    "mappedRecordChangeRate": 13.43,
    "datedMarketStates": 41751016,
    "datedMarketStateDelta": 2113492,
    "datedMarketStateChangeRate": 5.33,
    "gridCompletionRate": 99.45,
    "changedCells": 1681,
    "changedCellRate": 43.7
  },
  "comparisonGate": {
    "minimumCompletion": 90,
    "maximumCompletionShift": 5,
    "minimumBaselineRecords": 20,
    "methodsComparable": true,
    "totalAreas": 361,
    "comparableAreas": 341,
    "excludedAreas": 20,
    "statement": "An area can be compared only when both releases use the same method, are at least 90% complete, completion shifts by no more than 5 percentage points and the baseline contains at least 20 allocated records."
  },
  "comparableMovements": [
    {
      "code": "E06000008",
      "name": "Blackburn with Darwen",
      "slug": "blackburn-with-darwen",
      "country": "England",
      "region": "North West",
      "baselineRecords": 384,
      "currentRecords": 1086,
      "recordDelta": 702,
      "recordChangeRate": 182.81,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 714,
        "rentGrowth": 4.4,
        "salePrice": 165131,
        "priceGrowth24m": 13.6,
        "grossYield": 5.2,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000199",
      "name": "Tamworth",
      "slug": "tamworth",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 74,
      "currentRecords": 197,
      "recordDelta": 123,
      "recordChangeRate": 166.22,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 925,
        "rentGrowth": 0.5,
        "salePrice": 229251,
        "priceGrowth24m": 0,
        "grossYield": 4.8,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000234",
      "name": "Bromsgrove",
      "slug": "bromsgrove",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 977,
      "currentRecords": 2559,
      "recordDelta": 1582,
      "recordChangeRate": 161.92,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 992,
        "rentGrowth": 2,
        "salePrice": 335607,
        "priceGrowth24m": 3,
        "grossYield": 3.5,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000120",
      "name": "Hyndburn",
      "slug": "hyndburn",
      "country": "England",
      "region": "North West",
      "baselineRecords": 239,
      "currentRecords": 607,
      "recordDelta": 368,
      "recordChangeRate": 153.97,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 648,
        "rentGrowth": 3.7,
        "salePrice": 141430,
        "priceGrowth24m": 14.1,
        "grossYield": 5.5,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000117",
      "name": "Burnley",
      "slug": "burnley",
      "country": "England",
      "region": "North West",
      "baselineRecords": 334,
      "currentRecords": 765,
      "recordDelta": 431,
      "recordChangeRate": 129.04,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 631,
        "rentGrowth": 2.9,
        "salePrice": 135012,
        "priceGrowth24m": 14.6,
        "grossYield": 5.6,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000125",
      "name": "Rossendale",
      "slug": "rossendale",
      "country": "England",
      "region": "North West",
      "baselineRecords": 320,
      "currentRecords": 729,
      "recordDelta": 409,
      "recordChangeRate": 127.81,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 811,
        "rentGrowth": 4.3,
        "salePrice": 199759,
        "priceGrowth24m": 10.5,
        "grossYield": 4.9,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000122",
      "name": "Pendle",
      "slug": "pendle",
      "country": "England",
      "region": "North West",
      "baselineRecords": 413,
      "currentRecords": 935,
      "recordDelta": 522,
      "recordChangeRate": 126.39,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 670,
        "rentGrowth": 6.3,
        "salePrice": 152798,
        "priceGrowth24m": 17,
        "grossYield": 5.2,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E08000029",
      "name": "Solihull",
      "slug": "solihull",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 1185,
      "currentRecords": 2600,
      "recordDelta": 1415,
      "recordChangeRate": 119.41,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1279,
        "rentGrowth": 3.2,
        "salePrice": 337112,
        "priceGrowth24m": 5.2,
        "grossYield": 4.5,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E07000236",
      "name": "Redditch",
      "slug": "redditch",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 78,
      "currentRecords": 169,
      "recordDelta": 91,
      "recordChangeRate": 116.67,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 976,
        "rentGrowth": 11.1,
        "salePrice": 245573,
        "priceGrowth24m": -0.7,
        "grossYield": 4.6,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E08000025",
      "name": "Birmingham",
      "slug": "birmingham",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 5317,
      "currentRecords": 11517,
      "recordDelta": 6200,
      "recordChangeRate": 116.61,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1099,
        "rentGrowth": 3,
        "salePrice": 234257,
        "priceGrowth24m": 3.2,
        "grossYield": 5.6,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E06000058",
      "name": "Bournemouth, Christchurch and Poole",
      "slug": "bournemouth-christchurch-and-poole",
      "country": "England",
      "region": "South West",
      "baselineRecords": 4059,
      "currentRecords": 8678,
      "recordDelta": 4619,
      "recordChangeRate": 113.8,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1398,
        "rentGrowth": 2.8,
        "salePrice": 310094,
        "priceGrowth24m": -3.3,
        "grossYield": 5.4,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "E08000001",
      "name": "Bolton",
      "slug": "bolton",
      "country": "England",
      "region": "North West",
      "baselineRecords": 1048,
      "currentRecords": 2139,
      "recordDelta": 1091,
      "recordChangeRate": 104.1,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 894,
        "rentGrowth": 11.1,
        "salePrice": 204379,
        "priceGrowth24m": 8,
        "grossYield": 5.2,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    }
  ],
  "coverageGains": [],
  "regions": [
    {
      "name": "East Midlands",
      "areas": 35,
      "comparableAreas": 32,
      "baselineRecords": 29933,
      "currentRecords": 34752,
      "currentCompletion": 94.3,
      "baselineCompletion": 94.3,
      "recordDelta": 4819,
      "comparableShare": 91.4
    },
    {
      "name": "East of England",
      "areas": 45,
      "comparableAreas": 41,
      "baselineRecords": 46369,
      "currentRecords": 51992,
      "currentCompletion": 96.7,
      "baselineCompletion": 96.7,
      "recordDelta": 5623,
      "comparableShare": 91.1
    },
    {
      "name": "London",
      "areas": 33,
      "comparableAreas": 26,
      "baselineRecords": 81382,
      "currentRecords": 87321,
      "currentCompletion": 88,
      "baselineCompletion": 88,
      "recordDelta": 5939,
      "comparableShare": 78.8
    },
    {
      "name": "North East",
      "areas": 12,
      "comparableAreas": 12,
      "baselineRecords": 19604,
      "currentRecords": 21035,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": 1431,
      "comparableShare": 100
    },
    {
      "name": "North West",
      "areas": 35,
      "comparableAreas": 33,
      "baselineRecords": 49336,
      "currentRecords": 58160,
      "currentCompletion": 97.6,
      "baselineCompletion": 97.6,
      "recordDelta": 8824,
      "comparableShare": 94.3
    },
    {
      "name": "Northern Ireland",
      "areas": 11,
      "comparableAreas": 11,
      "baselineRecords": 9328,
      "currentRecords": 9362,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": 34,
      "comparableShare": 100
    },
    {
      "name": "Scotland",
      "areas": 32,
      "comparableAreas": 32,
      "baselineRecords": 51283,
      "currentRecords": 52947,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": 1664,
      "comparableShare": 100
    },
    {
      "name": "South East",
      "areas": 64,
      "comparableAreas": 63,
      "baselineRecords": 71246,
      "currentRecords": 78895,
      "currentCompletion": 99.8,
      "baselineCompletion": 99.8,
      "recordDelta": 7649,
      "comparableShare": 98.4
    },
    {
      "name": "South West",
      "areas": 27,
      "comparableAreas": 27,
      "baselineRecords": 82020,
      "currentRecords": 96940,
      "currentCompletion": 99,
      "baselineCompletion": 99,
      "recordDelta": 14920,
      "comparableShare": 100
    },
    {
      "name": "Wales",
      "areas": 22,
      "comparableAreas": 21,
      "baselineRecords": 39821,
      "currentRecords": 42765,
      "currentCompletion": 99.4,
      "baselineCompletion": 99.4,
      "recordDelta": 2944,
      "comparableShare": 95.5
    },
    {
      "name": "West Midlands",
      "areas": 30,
      "comparableAreas": 30,
      "baselineRecords": 32469,
      "currentRecords": 47102,
      "currentCompletion": 99.7,
      "baselineCompletion": 99.7,
      "recordDelta": 14633,
      "comparableShare": 100
    },
    {
      "name": "Yorkshire and The Humber",
      "areas": 15,
      "comparableAreas": 13,
      "baselineRecords": 39217,
      "currentRecords": 44846,
      "currentCompletion": 97.8,
      "baselineCompletion": 97.8,
      "recordDelta": 5629,
      "comparableShare": 86.7
    }
  ],
  "areaFocus": [
    {
      "code": "E06000008",
      "name": "Blackburn with Darwen",
      "slug": "blackburn-with-darwen",
      "country": "England",
      "region": "North West",
      "baselineRecords": 384,
      "currentRecords": 1086,
      "recordDelta": 702,
      "recordChangeRate": 182.81,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 714,
        "rentGrowth": 4.4,
        "salePrice": 165131,
        "priceGrowth24m": 13.6,
        "grossYield": 5.2,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "W06000015",
      "name": "Cardiff",
      "slug": "cardiff",
      "country": "Wales",
      "region": "Wales",
      "baselineRecords": 2123,
      "currentRecords": 3035,
      "recordDelta": 912,
      "recordChangeRate": 42.96,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1177,
        "rentGrowth": 3.5,
        "salePrice": 272252,
        "priceGrowth24m": 3.9,
        "grossYield": 5.2,
        "rentPeriod": "2026-08",
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "S12000028",
      "name": "South Ayrshire",
      "slug": "south-ayrshire",
      "country": "Scotland",
      "region": "Scotland",
      "baselineRecords": 873,
      "currentRecords": 990,
      "recordDelta": 117,
      "recordChangeRate": 13.4,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": null,
        "rentGrowth": null,
        "salePrice": 171905,
        "priceGrowth24m": 4.1,
        "grossYield": null,
        "rentPeriod": null,
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    },
    {
      "code": "N09000011",
      "name": "Ards and North Down",
      "slug": "ards-and-north-down",
      "country": "Northern Ireland",
      "region": "Northern Ireland",
      "baselineRecords": 1140,
      "currentRecords": 1164,
      "recordDelta": 24,
      "recordChangeRate": 2.11,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": null,
        "rentGrowth": null,
        "salePrice": 227275,
        "priceGrowth24m": 10.7,
        "grossYield": null,
        "rentPeriod": null,
        "salePeriod": "2026-07",
        "grossYieldPeriod": "2026-07"
      }
    }
  ],
  "files": {
    "release": "/data/releases/2026-10-12/manifest.json",
    "comparison": "/data/comparisons/2026-09-30--2026-10-12.json",
    "areaLayer": "/data/area-observations/2026-10-12.json",
    "atlas": "/data/releases/2026-10-12/property-atlas.json"
  },
  "atlasSnapshotSha256": "dd010ed4625ce97bc07dad2e7ecef04c453143b4715feddc1951918a2cb24d96",
  "limitations": [
    "4 releases use the current method. At least six consistent releases are required before monitoring trends.",
    "The 18 August 2026 area layer predates the immutable national manifest series. It remains available as historical evidence but is not counted as an approved national release.",
    "Current record representations are not counts of unique homes, bookings, tenancies or complete local market inventory.",
    "Local movement can reflect collection, geolocation and identity evidence as well as changes in the current market cross-section.",
    "Long-let rent, growth, sale-price and yield measures use their separately stated official evidence periods and are not inferred from the observation layer."
  ]
}