(1)On and after the appointed day the British Nationality Acts 1948 and 1958 shall have effect as if in subsection (3) of section 1 of the Act of 1948 (which provides for persons to be British subjects or Commonwealth citizens by virtue of citizenship of certain countries) for the words " the Federation of Malaya., the State of Singapore " there were substituted the word " Malaysia ".
(2)Save as provided by Schedule 1 to this Act, any person who immediately before the appointed day is a citizen of the United Kingdom and Colonies shall on that day cease to be such a citizen if on that day he becomes a citizen of the Federation.
(3)On and after the appointed day, section 6(2) of the British Nationality Act 1948 (which provides for the registration as a citizen of the United Kingdom and Colonies of a woman who has been married to such a citizen) shall not apply to a woman by virtue of her marriage to a person who on the appointed day ceases to be such a citizen under subsection (2) of this section, or would have done so if living on the appointed day.
(4)Part III of the British Nationality Act 1948 (which contains supplemental provisions) shall have effect for the purposes of the foregoing subsection and Schedule 1 to this Act as if those provisions were included in that Act.