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To vote in the UK, you now need photo ID.
Check you have valid ID by applying for a Voter Authority Certificate: the questions check if you already have valid ID. Not all ID cards are valid.
https://www.gov.uk/apply-for-photo-id-voter-authority-certificate
If you need a Voter Authority Certificate, it's free.
I used my phone to take a photo of myself in front of a white-ish wall. It was accepted for the voter certificate (and rejected in my passport renewal).
The certificate itself is paper and A4 size.
