The deadline to apply for a Voter Authority Certificate for the local elections in England on 4 May 2023 is 5pm on Tuesday 25 April 2023.
You need to be registered to vote before you apply for a Voter Authority Certificate.
When you register to vote, you’ll be asked whether you have photo ID or if you want to apply for a Voter Authority Certificate.
https://www.electoralcommission.org.uk/i-am-a/voter/voter-id/applying-a-voter-authority-certificate