https://geoportal.statistics.gov.uk/datasets/counties-and-unitary-authorities-december-2020-boundaries-uk-bfc
Counties and Unitary Authorities (December 2020) Boundaries UK BFC
Administrative Boundaries
unitary authoritiescountiesdecemberboundariesbfc
https://geoportal.statistics.gov.uk/datasets/counties-and-unitary-authorities-december-2025-boundaries-uk-bfe
Counties and Unitary Authorities (December 2025) Boundaries UK BFE
unitary authoritiescountiesdecemberboundariesbfe