Subject to subsection (3) where, apart from this Act, any matter affecting the validity of a marriage would fall to be determined (in accordance with the rules of private international law) by reference to the law of a country outside England and Wales, nothing in section 11, 12 or 13(1) above shall—
In the case of a marriage which purports to have been celebrated under the Foreign Marriage Acts 1892 to 1947 or has taken place outside England and Wales and purports to be a marriage under common law, section 11 above is without prejudice to any ground on which the marriage may be void under those Acts or, as the case may be, by virtue of the rules governing the celebration of marriages outside England and Wales under common law.
No marriage is to be treated as valid by virtue of subsection (1) if, at the time when it purports to have been celebrated, either party was already a civil partner.