Besides being registered for a vote in any election – be it General or Local – you will need to have a form of photographic ID to demonstrate to the Polling Officer that you are who you say you are. The Electoral Commission has explanatory material for all voting groups here:
https://www.electoralcommission.org.uk/i-am-a/voter/voter-id
With the elections planned for May 2023, South Norfolk have provided the following:
and, a list of approved Vote Identity documentation – https://www.southnorfolkandbroadland.gov.uk/elections/elections-act-2022