After you get your certificate
You must send your biometric residence permit (BRP) back to the Home Office within 5 working days of getting your certificate of British citizenship.
Cut your BRP into 4 pieces and put it in a windowless envelope.
Include a note saying you’re returning your permit because you’ve become a citizen. Include your name, date of birth and the document number (found on the front of the card) in the note.
Naturalisation BRP Returns
PO Box 195
You’ll be fined up to £1,000 if you do not return your permit within 5 working days.
Travelling to and from the UK
Once you have a British passport you must use this to enter the UK.
If you do not want a British passport you can apply for a certificate of entitlement instead.
You cannot enter the UK using your BRP or certificate of British citizenship.