Sex Discrimination Act 1975

The Sex Discrimination Act 1975 (c. 65) was an Act of the Parliament of the United Kingdom which protected men and women from discrimination on the grounds of sex or marital status. The Act concerned employment, training, education, harassment, the provision of goods and services, and the disposal of premises. 
The Sex Discrimination (Gender Reassignment) Regulations 1999, The Gender Recognition Act 2004 and The Sex Discrimination Act 1975 (Amendment) Regulations 2008 amended parts of this Act to apply to those who "intend to undergo, are undergoing or have undergone gender reassignment".