This file is a best fit lookup between 2011 middle layer super output areas, electoral wards/divisions and local authority districts in England and Wales as at 31 December 2017. (File Size - 2 MB) Field Names - MSOA11CD, MSOA11NM, WD17CD, WD17NM, WD17NMW, LAD17CD, LAD17NMField Types - Text, Text, Text, Text, Text, Text, TextField Lengths - 9, 32, 9, 56, 45, 9, 28REST URL of Feature Access Service – https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/MSOA11_WD17_EW_LU_ba70140bcd834e4ebecead893fd2fdb5/FeatureServer
For more information and an overview of best-fitting follow this link - https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about