http://www.legislation.gov.uk/ukpga/1987/42/section/28Family Law Reform Act 1987An Act to reform the law relating to the consequences of birth outside marriage; to make further provision with respect to the rights and duties of parents and the determination of parentage; and for connected purposes.1987-05-15texttext/xmlenStatute Law Database2025-05-14Expert Participation2019-12-02 Part VI281In subsection (1) of section 1 of the Legitimacy Act 1976 (legitimacy of children of certain void marriages), for the words “the act of intercourse resulting in the birth” there shall be substituted the words “ the insemination resulting in the birth or, where there was no such insemination, the child’s conception ”.2At the end of that section there shall be added the following subsections—3It is hereby declared for the avoidance of doubt that subsection (1) above applies notwithstanding that the belief that the marriage was valid was due to a mistake as to law.4In relation to a child born after the coming into force of section 28 of the Family Law Reform Act 1987, it shall be presumed for the purposes of subsection (1) above, unless the contrary is shown, that one of the parties to the void marriage reasonably believed at the time of the insemination resulting in the birth or, where there was no such insemination, the child’s conception (or at the time of the celebration of the marriage if later) that the marriage was valid.1976 c.31.