{
  "checked": "2026-09-25",
  "purpose": "Illustrative regional navigation for source-linked observations; not supplier territories, clinical catchments or service routing.",
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public-sector information, OGL v3.0. ONS / OS, Scottish Government, Welsh Government and Department of Health NI. Boundary vintages: England 2026; Scotland 2019; Wales 2023; NI 2018.",
  "derivation": {
    "England": "Fresh official ONS ArcGIS FeatureServer query, outSR=4326, ICB26CD/ICB26NM; joined current ODS code crosswalk from publicly sourced DShCR geography work.",
    "Scotland_Wales_Northern_Ireland": "Public-derived simplified geometry reused read-only from dmsGIS UK_Health_Board_Boundaries_Codex_2026_simplified.geojson. Only code/name/type/geometries retained; private operational fields and facility data excluded.",
    "coordinates": "Existing generalisation retained; coordinates rounded to 5 decimal places.",
    "identifiers": "England ONS code plus ODS crosswalk; Scotland/Wales geographic codes; NI local short trust map IDs."
  },
  "sources": {
    "England": "https://www.data.gov.uk/dataset/3735c4be-8ae8-43a3-8a7c-40fec660e6e5/integrated-care-boards-april-2026-boundaries-en-bsc",
    "England_download": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Integrated_Care_Boards_April_2026_Boundaries_EN_BSC/FeatureServer/0",
    "Scotland": "https://www.data.gov.uk/dataset/27d0fe5f-79bb-4116-aec9-a8e565ff756a/nhs-health-boards-scotland",
    "Wales": "https://datamap.gov.wales/layergroups/geonode%3ALocalHealthBoards",
    "Northern_Ireland": "https://www.data.gov.uk/dataset/0b04b46c-49af-45d5-b277-91b10937a01b/department-of-health-trust-boundaries"
  },
  "runtime": {
    "library": "Leaflet",
    "version": "1.9.4",
    "licence": "BSD-2-Clause",
    "upstream": "https://leafletjs.com/download.html",
    "delivery": "Pinned npm dependency; copied at MkDocs post-build into local site assets; no external tiles."
  }
}