Apply for British citizenship if you're married to, or in a civil partnership with, a British citizen - form AN, who's eligible, fees and how to apply. What is the cost to apply for British citizenship as a spouse?2.4 If you are the spouse or civil partner of a British citizen, you must have been in the UK on the date 3 years before making the application. Find out more about applying if you're married to or in a civil partnership with a British citizen on GOV.UK. Hundreds of people from Northern Ireland, including members of the Orange Order, applied to give up their British citizenship over the last decade. It is entirely possible, and indeed, often welcome, for resident nondoms to obtain British citizenship. The decision to apply for citizenship is a very personal one. Students can use this tool before lodging an application to find out what documents they need to attach to their application. Complete the online form: Complete all the fields on the online form. First Citizens provides a full range of banking products and services to meet your individual or business financial needs.