After changing your name by deed poll, you should update your entry on the electoral register so you can vote in your new name. The electoral register is maintained by your local Electoral Registration Officer (ERO), and the simplest way to update it is to re-register online at GOV.UK. There is no fee, and the process takes a few minutes. You do not need to send your deed poll to the Electoral Commission — re-registering simply replaces your old entry with the new details.
Re-registering online at GOV.UK will create a new entry in your new name and remove the old one (the ERO matches records by date of birth and address). You will be asked to confirm your nationality, address, and date of birth as part of the standard registration process. Your ability to vote is not affected during the brief administrative period between your update and the register being amended.
If you are on the open register (the version of the electoral roll available to the public and commercial organisations), the name update will flow through to that version as well. If you are not sure whether you are on the open register, you can check and opt out via your local council. Updating the electoral register is a minor but important step — it ensures your voting eligibility records are consistent with your legal name.