If you were born outside the United Kingdom before 1 January 1983, you became a British citizen if, immediately before that date, you were a citizen of the United Kingdom and Colonies and had the right of abode in the United Kingdom.
You may have had citizenship of the United Kingdom and Colonies by descent from a father who had that citizenship, or because you were registered or naturalised as a citizen of the United Kingdom and Colonies.
If you have a passport issued before 1 January 1983 that describes you as a citizen of the United Kingdom and Colonies on page 1, you will almost certainly have become a British citizen on 1 January 1983 as long as page 5 says 'Holder has the right of abode in the United Kingdom'.
However, if you had the right of abode because you were registered under the British Nationality (No2) Act 1964, you will not normally have become a British citizen on 1 January 1983 unless your mother became a British citizen then.
You may have had right of abode if:
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