(1)A person who was a British subject immediately before the date of the commencement of this Act and is at that date potentially a citizen of any country mentioned in subsection (3) of section one of this Act, but is not at that date a citizen of the United Kingdom and Colonies or of any country mentioned in that subsection or of Eire, shall as from that date remain a British subject without citizenship until he becomes a citizen of the United Kingdom and Colonies, a citizen of any country mentioned in subsection (3) of section one of this Act, a citizen of Eire or an alien ; and the provisions of the Third Schedule to this Act shall have effect in relation to a person who remains a British subject without citizenship by virtue of this section.
(2)A person remaining a British subject without citizenship as aforesaid shall become a citizen of the United Kingdom and Colonies on the day on which a citizenship law has taken effect in each of the countries mentioned in subsection (3) of section one of this Act of which he is potentially a citizen, unless he then becomes or has previously become a citizen of any country mentioned in subsection (3) of section one of this Act, or has previously become a citizen of the United Kingdom and Colonies, a citizen of Eire or an alien.
(3)A male person who becomes a. citizen of the United Kingdom and Colonies by virtue of the last foregoing subsection shall be deemed for the purposes of the proviso to subsection (1) of section five of this Act to be a citizen thereof by descent only.