If the Secretary of State by order declares that a description of persons specified in the order has, in pursuance of the Convention, been notified to the Government of the United Kingdom as the description of persons who are deemed to possess the nationality of a particular Convention country, persons of that description shall, subject to the following provisions of this section, be treated for the purposes of this Act as nationals of that country.
Subject to section 54(3) and subsection (3) of this section, where it appears to the court in any proceedings under this Act, or to any court by which a decision in pursuance of section 53(3) falls to be given, that a person is or was at a particular time a national of two or more countries, then—
A court in which proceedings are brought in pursuance of section 17, 52(3) or 53 shall be entitled to disregard the provisions of subsection (2) in so far as it appears to that court appropriate to do so for the purposes of those proceedings; but nothing in this subsection shall be construed as prejudicing the provisions of section 54(3).
Where, after such inquiries as the court in question considers appropriate, it appears to the court in any proceedings under this Act, or to any court by which such a decision as aforesaid falls to be given, that a person has no nationality or no ascertainable nationality, he shall be treated for the purposes of those proceedings or that decision as a national of the country in which he resides or, where that country is one of two or more countries having the same law of nationality, as a national of those countries.