What is the procedure for registering a British marriage in Thailand?

To register a British marriage in Thailand, start by legalizing your UK marriage certificate at the UK Legalisation Office in Milton Keynes, then have it certified by the Thai Embassy in London. Once in Thailand, get the certified marriage certificate translated into Thai by a recognized translator. Finally, visit your local Amphur (district) office to obtain a Thai marriage certificate and a Kor ror 2 document. It's advisable to check with the Amphur office beforehand to ensure you have all necessary documents.