How do I register as a British citizen if I have previously given up my citizenship?

This section provides details of how to register as a British citizen if you have previously given up citizenship of the United Kingdom and Colonies or British citizenship.

Registrations should be made using application form RS1. Before you send us your form, you should ensure that you have read the eligibility section.

Before you make your application for citizenship you should read guide RS1 - registration as a British citizen. This guide provides full details of the requirements you need to meet and how to complete the application form. You will need to confirm on the application form that you have read and understood the guide.