{
  "schemaVersion": 1,
  "comparisonId": "UI-CMP-2026-08-20-2026-08-26",
  "title": "UK Rental Observation Change",
  "baseline": {
    "releaseId": "UI-OBS-UK-2026-08-20",
    "date": "2026-08-20"
  },
  "current": {
    "releaseId": "UI-OBS-UK-2026-08-26",
    "date": "2026-08-26"
  },
  "intervalDays": 6,
  "analyticalUnit": "Release-to-release change in aggregate current record representations by fixed public observation cell.",
  "national": {
    "baselineMappedRecords": 99457,
    "currentMappedRecords": 98604,
    "mappedRecordDelta": -853,
    "mappedRecordChangeRate": -0.86,
    "baselineDatedMarketStates": 12654835,
    "currentDatedMarketStates": 15420026,
    "datedMarketStateDelta": 2765191,
    "datedMarketStateChangeRate": 21.85,
    "baselineCellsWithObservations": 2639,
    "currentCellsWithObservations": 2636,
    "cellsWithObservationsDelta": -3,
    "changedCells": 615,
    "changedCellRate": 16,
    "increasedCells": 38,
    "decreasedCells": 577,
    "unchangedCells": 3232,
    "grossCellIncreases": 101,
    "grossCellDecreases": 954,
    "absoluteCellMovement": 1055
  },
  "selectedArea": {
    "code": "E06000023",
    "name": "Bristol, City of",
    "baselineRecords": 338,
    "currentRecords": 333,
    "recordDelta": -5,
    "recordChangeRate": -1.48,
    "baselineCompletionRate": 100,
    "currentCompletionRate": 100,
    "baselineEquivalentCells": 1.2,
    "currentEquivalentCells": 1.2,
    "contributions": [
      {
        "label": "Bristol",
        "baselineCellRecords": 521,
        "currentCellRecords": 515,
        "cellDelta": -6,
        "baselineAllocatedRecords": 239,
        "currentAllocatedRecords": 236,
        "allocatedDelta": -3,
        "currentStatus": "complete"
      },
      {
        "label": "Severn Beach",
        "baselineCellRecords": 180,
        "currentCellRecords": 177,
        "cellDelta": -3,
        "baselineAllocatedRecords": 80,
        "currentAllocatedRecords": 78,
        "allocatedDelta": -2,
        "currentStatus": "complete"
      },
      {
        "label": "Kingswood",
        "baselineCellRecords": 106,
        "currentCellRecords": 105,
        "cellDelta": -1,
        "baselineAllocatedRecords": 15,
        "currentAllocatedRecords": 15,
        "allocatedDelta": 0,
        "currentStatus": "complete"
      },
      {
        "label": "Mangotsfield",
        "baselineCellRecords": 75,
        "currentCellRecords": 73,
        "cellDelta": -2,
        "baselineAllocatedRecords": 3,
        "currentAllocatedRecords": 3,
        "allocatedDelta": 0,
        "currentStatus": "complete"
      },
      {
        "label": "Portishead",
        "baselineCellRecords": 6,
        "currentCellRecords": 6,
        "cellDelta": 0,
        "baselineAllocatedRecords": 1,
        "currentAllocatedRecords": 1,
        "allocatedDelta": 0,
        "currentStatus": "complete"
      }
    ]
  },
  "largestIncreases": [
    {
      "label": "Brighton",
      "baseline": 576,
      "current": 601,
      "delta": 25,
      "currentStatus": "capped"
    },
    {
      "label": "Chichester",
      "baseline": 245,
      "current": 261,
      "delta": 16,
      "currentStatus": "complete"
    },
    {
      "label": "Deal",
      "baseline": 94,
      "current": 99,
      "delta": 5,
      "currentStatus": "complete"
    },
    {
      "label": "Grange Over Sands",
      "baseline": 109,
      "current": 113,
      "delta": 4,
      "currentStatus": "complete"
    },
    {
      "label": "Winster",
      "baseline": 103,
      "current": 107,
      "delta": 4,
      "currentStatus": "complete"
    },
    {
      "label": "Sidmouth",
      "baseline": 104,
      "current": 107,
      "delta": 3,
      "currentStatus": "complete"
    },
    {
      "label": "Plymouth",
      "baseline": 232,
      "current": 234,
      "delta": 2,
      "currentStatus": "capped"
    },
    {
      "label": "Pevensey",
      "baseline": 55,
      "current": 57,
      "delta": 2,
      "currentStatus": "complete"
    },
    {
      "label": "Tangmere",
      "baseline": 33,
      "current": 35,
      "delta": 2,
      "currentStatus": "complete"
    },
    {
      "label": "Ashford",
      "baseline": 44,
      "current": 46,
      "delta": 2,
      "currentStatus": "complete"
    }
  ],
  "largestDecreases": [
    {
      "label": "Wembley",
      "baseline": 4137,
      "current": 4125,
      "delta": -12,
      "currentStatus": "capped"
    },
    {
      "label": "Liverpool",
      "baseline": 831,
      "current": 820,
      "delta": -11,
      "currentStatus": "capped"
    },
    {
      "label": "Blackpool",
      "baseline": 395,
      "current": 386,
      "delta": -9,
      "currentStatus": "capped"
    },
    {
      "label": "Edinburgh",
      "baseline": 1290,
      "current": 1281,
      "delta": -9,
      "currentStatus": "complete"
    },
    {
      "label": "Peckham",
      "baseline": 1248,
      "current": 1240,
      "delta": -8,
      "currentStatus": "complete"
    },
    {
      "label": "York",
      "baseline": 520,
      "current": 512,
      "delta": -8,
      "currentStatus": "capped"
    },
    {
      "label": "Ilfracombe",
      "baseline": 257,
      "current": 250,
      "delta": -7,
      "currentStatus": "capped"
    },
    {
      "label": "Bath",
      "baseline": 372,
      "current": 365,
      "delta": -7,
      "currentStatus": "complete"
    },
    {
      "label": "London",
      "baseline": 5033,
      "current": 5026,
      "delta": -7,
      "currentStatus": "complete"
    },
    {
      "label": "Barking",
      "baseline": 799,
      "current": 792,
      "delta": -7,
      "currentStatus": "complete"
    }
  ],
  "limitations": [
    "Changes describe released observations and collection state, not verified additions to or removals from housing stock.",
    "Records are not deduplicated homes and can move between cells or sources as location and identity evidence changes.",
    "A short comparison interval is a system-monitoring result, not a market trend.",
    "Local-authority values are weighted allocations from fixed observation cells and are not exact property counts."
  ]
}