Apply for British citizenship Find out about the the ways you can apply for British citizenship. Nationality Checking Service Nationality Checking Service is designed to assist people applying for British citizenship. Find out how to apply and how much it costs. Learn more about citizenship ceremonies Find out about citizenship ceremonies in the borough, how to book, who can attend and what to expect at the ceremony. Use our European Passport Return Service Our European Passport Return Service allows people who have applied online for British Citizenship to keep their original passport when submitting documents to the Home Office.