A court in England and Wales shall not be precluded from granting matrimonial relief or making a declaration concerning the validity of a marriage by reason only that either party to the marriage is, or has during the subsistence of the marriage been, married to more than one person.
In this section "matrimonial relief" means—
any order under Part I of this Act;
a financial provision order under section 27 above;
an order under section 35 above altering a maintenance agreement;
an order under any provision of this Act which confers a power exercisable in connection with, or in connection with proceedings for, any such ... order as is mentioned in paragraphs (a) to (c) above;
an order under Part III of the Matrimonial and Family Proceedings Act 1984;
an order under Part I of the Domestic Proceedings and Magistrates' Courts Act 1978.
In this section "a declaration concerning the validity of a marriage" means any declaration under Part III of the Family Law Act 1986 involving a determination as to the validity of a marriage
Provision may be made by rules of court—
for requiring notice of proceedings brought by virtue of this section to be served on any additional spouse of a party to the marriage in question; and
for conferring on any such additional spouse the right to be heard in the proceedings,
in such cases as may be specified in the rules.