What is the Supreme Court ruling? In April 2025, the Supreme Court ruled that the legal definition of a woman is based on biological sex. This means single-sex toilets, for example, must be used based on a person’s sex at birth, instead of their gender. Previously, NHS guidance meant trans people were accommodated on wards based on the gender with which they identify. Yes, under the changes trans people are still protected under the Equality Act 2010.