Apply for British citizenship if you're an Irish citizen
After you get your certificate
Once you have become a British citizen you can travel to and from the UK using:
- a British passport
- an Irish passport
- an Irish passport card
You can also apply for a certificate of entitlement to be placed in another country’s passport if you have another nationality.
There are different document requirements if you are a British citizen and are travelling to the UK from Ireland, Isle of Man, Guernsey or Jersey.
If you have a biometric residence permit (BRP)
If you have a BRP you must send it back to the Home Office within 5 working days of getting your certificate of British citizenship - even if it’s expired.
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 on the front of your BRP.
Naturalisation BRP Returns
PO Box 195
Bristol
BS20 1BT
You’ll be fined up to £1,000 if you do not return your BRP within 5 working days of getting your certificate.