# British Nationality (No. 2) Act 1964, Paragraph 1


(1) A person born before the commencement of the principal Act is qualified for registration under section 1 of this Act by parentage if—
(a) his mother was a British subject at the time when he was born or a person who, by virtue of section 14 of that Act, is deemed (or would but for her death be deemed) to have been a British subject immediately before the commencement of that Act; or
(b) his father or mother was a person who, by virtue of section 15 or 17 of that Act, is deemed (or would but for his or her death be deemed) to have been a British subject immediately before the commencement of that Act;
and, in either case, the relevant parent became (or would but for his or her death have become) a citizen of the United Kingdom and Colonies at the commencement of that Act.
(2) For the purposes of sub-paragraph (1)(a) above a person who by the law in force in any colony or protectorate enjoyed the privileges of naturalisation within that colony or protectorate only shall be treated as having been a British subject.

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Source: https://www.legislation.gov.uk/ukpga/1964/54/schedule/paragraph/1 (the official version)
Page: https://openlegislation.uk/british-nationality-no-2-act-1964/schedule/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.