Can I be naturalised as a British citizen?

If you are over 18 and have been living in the United Kingdom for the last five years (or three years if you are married to or a civil partner of a British citizen) you may be able to apply for naturalisation as a British citizen. You may also be able to apply for naturalisation if you or your husband, wife or civil partner is in crown or designated service outside the United Kingdom. Applications for naturalisation are made using application form AN.

källa:http://www.ukba.homeoffice.gov.uk/britishcitizenship/eligibility/