Corbett v Corbett is a family law divorce case and referral to a court of binding precedent in the United Kingdom, heard in November and December 1969. It includes a February 1971 appeal-level referred decision, which set out a detailed, narrow, legal set of criteria by which a very small minority of transgender people, those physically born intersex, could qualify to be recognised as of their new sex in the United Kingdom.
The decision confirmed the traditional view that the marriage of any transgender person falling short of those criteria was void (until later legislative change). It narrowly pre-dated a period of marital separation with mutual consent as a standard reason to dissolve a marriage in simple paper form, and Arthur Corbett, the plaintiff, sought a method of dissolving his marriage which took place with all of the usual formalities to transgender model April Ashley (or Corbett), who had brought a petition under the Matrimonial Causes Act 1965 for maintenance.
The husband's case to dismiss the marriage rested on the traditional view that April remained a man after her change of sex significantly before the marriage ceremony. The Court ruled that the marriage was void ab initio. A very full range of medical opinion on transgender people was consulted by the Court. John Randell, the man who set up the first transgender clinic at Charing Cross hospital, stated that Ashley was ‘properly classified as a male homosexual transsexualist’ whilst other court doctors preferred the description castrated male. The judge Lord Justice Ormrod, created a medical 'test' and definition to determine the legal status of April Ashley. Ormrod set out four criteria for determining 'sex': (i) Chromosomal factors; (ii) Gonadal factors (i.e. presence or absence of testes or ovaries); (iii) Genital factors (including internal sex organs); (iv) Psychological factors. Transsexualism was deemed to fall under 'Psychological factors'.
The Court ruled that it was impossible to change sex and plainly distinguished legal statuses for which gender, which could change, was appropriate (National Insurance) from those for which sex was the determining category, among which marriage was the most prominent. The law was restated that marriage was necessarily between a man and a woman. It added that both were defined according to sex rather than gender. The ruling was then taken up and used to define the sex of transgender people for many purposes until the introduction of the Gender Recognition Act 2004 (which ultimately defined the sex of transgender people as whatever is on their birth certificate, until such point as a Gender Recognition Certificate amends the birth certificate; hence for those who do not possess such a certificate, nothing has changed since 1970).
As a result of LJ Ormrod's decision, alternative ways to achieve amendment of birth certificates for transgender and intersex people ceased.