For example, a US citizen who has naturalised as a British citizen can apply for a certificate of entitlement to be affixed inside his or her US passport to prove that he or she is free from immigration restrictions in the UK, rather than obtaining a British passport. A British Overseas Territories Citizen from the British Virgin Islands who is also a British citizen can apply for a certificate of entitlement to be affixed inside his or her British Virgin Islands passport to prove that he or she is free from immigration restrictions in the UK, rather than obtaining a British citizen passport.