{
  "schemaVersion": 2,
  "briefingId": "UI-BRF-2026-08-26",
  "title": "UK Property Evidence Briefing",
  "releaseDate": "2026-08-26",
  "publishedAt": "2026-08-26T18:32:54.878Z",
  "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-2026-08-26",
    "baselineReleaseId": "UI-OBS-UK-2026-08-20",
    "baselineDate": "2026-08-20",
    "currentDate": "2026-08-26",
    "intervalDays": 6
  },
  "maturity": {
    "releaseCount": 2,
    "minimumTrendReleases": 6,
    "stage": "release-comparison",
    "trendReady": false,
    "statement": "2 approved releases support comparison, not a market trend claim."
  },
  "national": {
    "mappedRecords": 98604,
    "mappedRecordDelta": -853,
    "mappedRecordChangeRate": -0.86,
    "datedMarketStates": 15420026,
    "datedMarketStateDelta": 2765191,
    "datedMarketStateChangeRate": 21.85,
    "gridCompletionRate": 98.8,
    "changedCells": 615,
    "changedCellRate": 16
  },
  "comparisonGate": {
    "minimumCompletion": 90,
    "maximumCompletionShift": 5,
    "minimumBaselineRecords": 20,
    "totalAreas": 361,
    "comparableAreas": 316,
    "excludedAreas": 45,
    "statement": "An area is comparison-ready only when both releases 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": "E08000031",
      "name": "Wolverhampton",
      "slug": "wolverhampton",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 64,
      "currentRecords": 60,
      "recordDelta": -4,
      "recordChangeRate": -6.25,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 938,
        "rentGrowth": 11.3,
        "salePrice": 216339,
        "priceGrowth24m": 11.7,
        "grossYield": 5.2,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000170",
      "name": "Ashfield",
      "slug": "ashfield",
      "country": "England",
      "region": "East Midlands",
      "baselineRecords": 21,
      "currentRecords": 20,
      "recordDelta": -1,
      "recordChangeRate": -4.76,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 790,
        "rentGrowth": 4.7,
        "salePrice": 188423,
        "priceGrowth24m": 2.6,
        "grossYield": 5,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000008",
      "name": "Cambridge",
      "slug": "cambridge",
      "country": "England",
      "region": "East of England",
      "baselineRecords": 45,
      "currentRecords": 43,
      "recordDelta": -2,
      "recordChangeRate": -4.44,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1804,
        "rentGrowth": 1.8,
        "salePrice": 467028,
        "priceGrowth24m": -1.8,
        "grossYield": 4.6,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000130",
      "name": "Charnwood",
      "slug": "charnwood",
      "country": "England",
      "region": "East Midlands",
      "baselineRecords": 68,
      "currentRecords": 65,
      "recordDelta": -3,
      "recordChangeRate": -4.41,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 957,
        "rentGrowth": 3.8,
        "salePrice": 278883,
        "priceGrowth24m": 8.5,
        "grossYield": 4.1,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000103",
      "name": "Watford",
      "slug": "watford",
      "country": "England",
      "region": "East of England",
      "baselineRecords": 25,
      "currentRecords": 24,
      "recordDelta": -1,
      "recordChangeRate": -4,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1817,
        "rentGrowth": 3.8,
        "salePrice": 395360,
        "priceGrowth24m": 1.6,
        "grossYield": 5.5,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000107",
      "name": "Dartford",
      "slug": "dartford",
      "country": "England",
      "region": "South East",
      "baselineRecords": 76,
      "currentRecords": 73,
      "recordDelta": -3,
      "recordChangeRate": -3.95,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1566,
        "rentGrowth": 3.2,
        "salePrice": 337333,
        "priceGrowth24m": -1.6,
        "grossYield": 5.6,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E06000032",
      "name": "Luton",
      "slug": "luton",
      "country": "England",
      "region": "East of England",
      "baselineRecords": 56,
      "currentRecords": 54,
      "recordDelta": -2,
      "recordChangeRate": -3.57,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1219,
        "rentGrowth": 2.4,
        "salePrice": 282653,
        "priceGrowth24m": 3.3,
        "grossYield": 5.2,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E06000012",
      "name": "North East Lincolnshire",
      "slug": "north-east-lincolnshire",
      "country": "England",
      "region": "Yorkshire and The Humber",
      "baselineRecords": 116,
      "currentRecords": 112,
      "recordDelta": -4,
      "recordChangeRate": -3.45,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 623,
        "rentGrowth": 4,
        "salePrice": 148294,
        "priceGrowth24m": 5,
        "grossYield": 5,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000033",
      "name": "Bolsover",
      "slug": "bolsover",
      "country": "England",
      "region": "East Midlands",
      "baselineRecords": 30,
      "currentRecords": 29,
      "recordDelta": -1,
      "recordChangeRate": -3.33,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 712,
        "rentGrowth": 6.7,
        "salePrice": 186908,
        "priceGrowth24m": 10.9,
        "grossYield": 4.6,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000202",
      "name": "Ipswich",
      "slug": "ipswich",
      "country": "England",
      "region": "East of England",
      "baselineRecords": 30,
      "currentRecords": 29,
      "recordDelta": -1,
      "recordChangeRate": -3.33,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 990,
        "rentGrowth": 3.3,
        "salePrice": 219718,
        "priceGrowth24m": 1.2,
        "grossYield": 5.4,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000011",
      "name": "Huntingdonshire",
      "slug": "huntingdonshire",
      "country": "England",
      "region": "East of England",
      "baselineRecords": 124,
      "currentRecords": 120,
      "recordDelta": -4,
      "recordChangeRate": -3.23,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 1049,
        "rentGrowth": 3.7,
        "salePrice": 306605,
        "priceGrowth24m": 6.5,
        "grossYield": 4.1,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "E07000123",
      "name": "Preston",
      "slug": "preston",
      "country": "England",
      "region": "North West",
      "baselineRecords": 62,
      "currentRecords": 64,
      "recordDelta": 2,
      "recordChangeRate": 3.23,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 786,
        "rentGrowth": 6.8,
        "salePrice": 186418,
        "priceGrowth24m": 10,
        "grossYield": 5.1,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    }
  ],
  "coverageGains": [],
  "regions": [
    {
      "name": "East Midlands",
      "areas": 35,
      "comparableAreas": 31,
      "baselineRecords": 4681,
      "currentRecords": 4631,
      "currentCompletion": 94.4,
      "baselineCompletion": 94.4,
      "recordDelta": -50,
      "comparableShare": 88.6
    },
    {
      "name": "East of England",
      "areas": 45,
      "comparableAreas": 41,
      "baselineRecords": 7244,
      "currentRecords": 7127,
      "currentCompletion": 98.6,
      "baselineCompletion": 98.6,
      "recordDelta": -117,
      "comparableShare": 91.1
    },
    {
      "name": "England",
      "areas": 2,
      "comparableAreas": 2,
      "baselineRecords": 246,
      "currentRecords": 245,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": -1,
      "comparableShare": 100
    },
    {
      "name": "London",
      "areas": 32,
      "comparableAreas": 23,
      "baselineRecords": 14541,
      "currentRecords": 14492,
      "currentCompletion": 83.6,
      "baselineCompletion": 83.6,
      "recordDelta": -49,
      "comparableShare": 71.9
    },
    {
      "name": "North East",
      "areas": 12,
      "comparableAreas": 12,
      "baselineRecords": 2811,
      "currentRecords": 2781,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": -30,
      "comparableShare": 100
    },
    {
      "name": "North West",
      "areas": 35,
      "comparableAreas": 27,
      "baselineRecords": 8109,
      "currentRecords": 8048,
      "currentCompletion": 92.3,
      "baselineCompletion": 92.3,
      "recordDelta": -61,
      "comparableShare": 77.1
    },
    {
      "name": "Northern Ireland",
      "areas": 11,
      "comparableAreas": 11,
      "baselineRecords": 2528,
      "currentRecords": 2505,
      "currentCompletion": 100,
      "baselineCompletion": 100,
      "recordDelta": -23,
      "comparableShare": 100
    },
    {
      "name": "Scotland",
      "areas": 32,
      "comparableAreas": 31,
      "baselineRecords": 10241,
      "currentRecords": 10146,
      "currentCompletion": 99.9,
      "baselineCompletion": 99.9,
      "recordDelta": -95,
      "comparableShare": 96.9
    },
    {
      "name": "South East",
      "areas": 64,
      "comparableAreas": 60,
      "baselineRecords": 11697,
      "currentRecords": 11640,
      "currentCompletion": 98.6,
      "baselineCompletion": 98.6,
      "recordDelta": -57,
      "comparableShare": 93.8
    },
    {
      "name": "South West",
      "areas": 26,
      "comparableAreas": 23,
      "baselineRecords": 17881,
      "currentRecords": 17708,
      "currentCompletion": 94.1,
      "baselineCompletion": 94.1,
      "recordDelta": -173,
      "comparableShare": 88.5
    },
    {
      "name": "Wales",
      "areas": 22,
      "comparableAreas": 20,
      "baselineRecords": 8452,
      "currentRecords": 8354,
      "currentCompletion": 98.3,
      "baselineCompletion": 98.3,
      "recordDelta": -98,
      "comparableShare": 90.9
    },
    {
      "name": "West Midlands",
      "areas": 30,
      "comparableAreas": 24,
      "baselineRecords": 4605,
      "currentRecords": 4565,
      "currentCompletion": 97.6,
      "baselineCompletion": 97.6,
      "recordDelta": -40,
      "comparableShare": 80
    },
    {
      "name": "Yorkshire and The Humber",
      "areas": 15,
      "comparableAreas": 11,
      "baselineRecords": 6421,
      "currentRecords": 6362,
      "currentCompletion": 90.6,
      "baselineCompletion": 90.6,
      "recordDelta": -59,
      "comparableShare": 73.3
    }
  ],
  "areaFocus": [
    {
      "code": "E08000031",
      "name": "Wolverhampton",
      "slug": "wolverhampton",
      "country": "England",
      "region": "West Midlands",
      "baselineRecords": 64,
      "currentRecords": 60,
      "recordDelta": -4,
      "recordChangeRate": -6.25,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 938,
        "rentGrowth": 11.3,
        "salePrice": 216339,
        "priceGrowth24m": 11.7,
        "grossYield": 5.2,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "S12000028",
      "name": "South Ayrshire",
      "slug": "south-ayrshire",
      "country": "Scotland",
      "region": "Scotland",
      "baselineRecords": 173,
      "currentRecords": 169,
      "recordDelta": -4,
      "recordChangeRate": -2.31,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": null,
        "rentGrowth": null,
        "salePrice": 171288,
        "priceGrowth24m": 9.3,
        "grossYield": null,
        "rentPeriod": null,
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "W06000004",
      "name": "Denbighshire",
      "slug": "denbighshire",
      "country": "Wales",
      "region": "Wales",
      "baselineRecords": 313,
      "currentRecords": 306,
      "recordDelta": -7,
      "recordChangeRate": -2.24,
      "baselineCompletion": 99,
      "currentCompletion": 99,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": 709,
        "rentGrowth": 5.9,
        "salePrice": 200146,
        "priceGrowth24m": 8.8,
        "grossYield": 4.3,
        "rentPeriod": "2026-06",
        "salePeriod": "2026-05"
      }
    },
    {
      "code": "N09000009",
      "name": "Mid Ulster",
      "slug": "mid-ulster",
      "country": "Northern Ireland",
      "region": "Northern Ireland",
      "baselineRecords": 103,
      "currentRecords": 101,
      "recordDelta": -2,
      "recordChangeRate": -1.94,
      "baselineCompletion": 100,
      "currentCompletion": 100,
      "completionShift": 0,
      "comparable": true,
      "measures": {
        "averageRent": null,
        "rentGrowth": null,
        "salePrice": 189542,
        "priceGrowth24m": 13.2,
        "grossYield": null,
        "rentPeriod": null,
        "salePeriod": "2026-05"
      }
    }
  ],
  "files": {
    "release": "/data/releases/2026-08-26/manifest.json",
    "comparison": "/data/comparisons/2026-08-20--2026-08-26.json",
    "areaLayer": "/data/area-observations/2026-08-26.json",
    "atlas": "/data/latest/property-atlas.json"
  },
  "limitations": [
    "2 approved releases establish a comparison, not a market trend. The series requires at least six consistent releases before repeated direction is described as trend monitoring.",
    "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."
  ]
}
