This file is a best-fit lookup between 2011 lower layer super output areas and upper tier local authorities in England and Wales as at 31 December 2017. (File size - 6MB)Field Names - LSOA11CD, LSOA11NM, UTLA17CD, UTLA17NMField Types - Text, Text, Text, TextField Lengths - 9, 33, 9, 28W01000060 - Gwynedd 15B - now correctly allocated to 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_UTLA17_EW_LU_fc16626637fa480f8164e11378f5a1e4/FeatureServer