Apply for British citizenship if you're an Irish citizen
After you've applied
You’ll usually get a decision within 6 months - some applications can take longer. If yours will take longer you’ll be told before 6 months have passed.
You’ll be told if you need to provide more information to help with your application.
If your circumstances change
You should contact UK Visas and Immigration if your situation changes during your application (for example, you move house, get married or are arrested).
Nationality contact centre
nationalityenquiries@homeoffice.gov.uk
Attending a citizenship ceremony
You’ll need to attend a citizenship ceremony if your application is successful. You’ll be given a certificate of British citizenship at the ceremony - you can use this to prove you are British.