This file contains the digital vector boundaries for Local Authority Districts in England and Wales as at December 2021.It is joined to the Rural Urban Classification data 2021.The Rural-Urban Classification is a Government Statistical Service product developed by the Office for National Statistics; the Department for Environment, Food and Rural Affairs; and the Welsh Assembly Government.Source: Office for National Statistics licensed under the Open Government Licence v.3.0.Contains OS data © Crown copyright 2025Links below to FAQ, Methodology and User GuideFAQ https://geoportal.statistics.gov.uk/documents/ebfac455db0642afaa5052738ce5c32e/about Methodology https://geoportal.statistics.gov.uk/documents/833a35f2a1ec49d98466b679ae0a0646/about User Guide https://geoportal.statistics.gov.uk/documents/c8e8e6db38e04cb8937569d74bce277a/aboutt The boundaries available are:(BUC) Ultra generalised (500m) - clipped to the coastline (Mean High Water mark).Contains both Ordnance Survey and ONS Intellectual Property Rights.