A best fit lookup between 2001 Lower layer Super Output Areas (LSOA), built-up area sub-divisions (BUASD), built-up areas (BUA), local authority districts (LAD) and regions (RGN) as at 31 December 2011. (File size - 2MB)Field Names - LSOA01CD, LSOA01NM, BUASD11CD, BUASD11NM, BUA11CD, BUA11NM, LAD11CD, LAD11NM, LAD11NMW, RGN11CD, RGN11NMField Types - Text, Text, Text, Text, Text, Text, Text, Text, Text, Text, Text, Field Lengths - 9, 33, 9, 44, 9, 50, 9, 28, 24, 9, 24
For more information and an overview of best-fitting follow this link - https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about
REST URL of Feature Access Service – https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/LSOA01_BUASD11_BUA11_LAD11_RGN11_EW_LU_8ac85fc24ca643e093078965212b8f9c/FeatureServer