This file is a best fit lookup between 2011 lower layer super output areas, electoral wards/divisions and local authority districts in England and Wales as at 31 December 2017. (File Size - 7 MB) Field Names - LSOA11CD, LSOA11NM, WD17CD, WD17NM, WD17NMW, LAD17CD, LAD17NMField Types - Text, Text, Text, Text, Text, Text, TextField Lengths - 9, 33, 9, 56, 45, 9, 28W01000060 - Gwynedd 015B - now correctly allocated to W05000056 - Corris/Mawddwy - W06000002- Gwynedd
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/LSOA11_WD17_EW_LU_c65dfe9ca2fa4b0fa578b65a4d5c9856/FeatureServer