The UK’s Supreme Court has ruled that “man”, “woman” and “sex” in the Equality Act 2010 refer to sex, not self-ID or paperwork (gender-recognition certificates). This agreed with our legal interpretation. We have published new guidance and are in the process of updating our publications to reflect the judgment. We are also working to provide answers to the questions we're hearing from supporters and the media. We will publish these as soon as possible.

Why Sex Matters is calling for clarification of the Equality Act
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Why Sex Matters is calling for clarification of the Equality Act 2010 – a briefing

Sex Matters has launched a petition calling on the government to clarify that in the Equality Act 2010, “sex” means biological sex, and is not modified by the Gender Recognition Act 2004.

This would protect the rights of people of both sexes, as well as people who identify as transgender. This briefing explains why we are calling for this clarification of the law.