Thousands of demonstrators gathered in Parliament Square, London, to protest a recent UK Supreme Court ruling that defines “woman” under the Equality Act 2010 as someone born biologically female. The decision, which excludes transgender women from this legal definition, has raised concerns among trans rights advocates about potential restrictions on access to single-sex spaces and services. Protesters, including activists, trade unions, and community organisations, rallied to express solidarity with the trans community and to call for the protection of transgender rights.