Dataset - data.gov.uk

Lower Layer Super Output Area (2011) to Upper Tier Local Authorities (2017)...

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...
- HTML
- Esri REST
- GeoJSON
- CSV
Ward to Westminster Parliamentary Constituency to Local Authority District...

This file is a lookup between electoral wards/divisions, Westminster parliamentary constituencies, local authority districts and upper tier local authorities in the United...
- HTML
- Esri REST
- GeoJSON
- CSV

You can also access this registry using the API (see API Docs).