Becoming British . Some people are born British.
Some people become British by operation of law after adoption, or if their parents marry.
British Sometimes after their parents are recognised as refugees or are given Indefinite Leave under a concession If they are born stateless in the UK and have been in the UK for 10 years. Marriage to a British Citizen. You must be 18 years or over and not of unsound mind. You must be married to a British Citizen, you must have Indefinite Leave and you must have been in the UK legally for 3 years. There are special rules where the British Citizen is abroad on Crown Service or similar.