The United Kingdom’s Supreme Court has ruled that a woman is defined by “biological sex” under the country’s equality law – excluding transgender women – in a case that is expected to impact accommodations for trans women in bathrooms,

Judges say the "concept of sex is binary" while adding that transgender people will still have protection against discrimination.

The decision clears legal ambiguity and confirms that single-sex services for women such as refuges, hospital wards and sports can exclude trans women.