In the U.K., changing your name is a legal matter. That means that there's no “official” place where you go to register your new name. In law, your name is legally established by usage — in theory you can just start using a new name, and gradually become known by it.
However — to update your passport, driving licence, and most other official documents, you’ll need some kind of formal document which proves that you’ve changed your name, and when you changed it.
A deed poll (or change of name deed) is a formal contract that legally binds you to giving up your old name and using a new name for all purposes. It’s accepted by all government bodies in the U.K., including HM Passport Office (formerly the Identity & Passport Service) and the DVLA. It’s also accepted by all banks and other organisations in the U.K.
You’ll have to sign and date your deed poll, and it also needs to be witnessed. When you make an application with us, we’ll send you full instructions on how to complete the document, and what to do with it afterwards.
If you’ve recently got married or divorced, or entered a civil partnership, you may be able to use a document that you already have, instead of a deed poll.