Subject to sections 51 and 52 of this Act, the validity of a divorce, annulment or legal separation obtained in a country outside the British Islands (in this Part referred to as an overseas divorce, annulment or legal separation) shall be recognised in the United Kingdom if, and only if, it is entitled to recognition—
(a)by virtue of sections 46 to 49 of this Act, or
(b)by virtue of any enactment other than this Part.