You’ll usually need valid passports or other accepted proof of identity and nationality, proof of address, and details of the venue and ceremony. If either of you has been married before, you may also need a divorce final order (formerly decree absolute) or the former spouse’s death certificate. Non-UK nationals may need evidence of immigration status, and documents not in English generally require an approved translation. Requirements differ across England and Wales, Scotland and Northern Ireland, so check with the relevant register office or GOV.UK before giving notice.