A problem arises where one of them has been married before,
and has reason to think the first partner is dead, but cannot
prove it. In English law if one partner is absent for seven
years continuously, and has not been heard of by the other,
then the other may marry again without risk of being found
guilty of bigamy. But if the original party happens to be
alive, he is still the true husband, and the second ceremony
is not a marriage. Since the Matrimonial Causes Act of 1950,
it is permissible for anyone domiciled in England, whose
partner has thus vanished and who has good ground for thinking
the partner dead, to approach the court; and if the grounds
are found reasonable–which may mean at a minimum that the
petitioning party has made the enquiries possible in the
circumstances–the court may make a decree allowing death to
be presumed and dissolving the marriage. Once the decree is
made absolute, even the reappearance of the absent partner
does not affect the validity of the second marriage.