One year after a Supreme Court ruling clarified the legal definition of sex in the United Kingdom, the battle over single-sex spaces continues to provoke debate and resistance among public institutions and advocacy groups. The ruling, which reaffirmed that sex is determined biologically rather than by self-identification, has led to updated guidance aimed at ensuring compliance with the Equality Act. However, enforcement and implementation remain contentious issues.

Advocates for maintaining single-sex spaces argue that women’s safety and privacy must not be compromised by policies allowing individuals to self-identify their gender, particularly when it comes to intimate or vulnerable settings such as changing rooms, hospital wards, and rape crisis centres. They assert that biological differences between men and women are relevant in these contexts, and that ignoring them jeopardises women’s wellbeing. Supporters of this view highlight data showing that men account for the overwhelming majority of sexual offences and violent crimes, pointing to studies indicating that trans women retain a male pattern of offending consistent with biological males. They suggest that concerns over security should supersede arguments based on self-identification.

Critics of this perspective caution against conflating transgender identities with criminality or inherent threat. They argue that the number of trans women is small, making statistical interpretations complex and potentially misleading when individual cases are highlighted. Many also perceive the framing of transgender individuals as dangerous as stigmatizing and detrimental to efforts promoting inclusion and equality. Advocates for transgender rights contend that denying self-identification undermines the dignity and recognition of transgender people, and that policy should be informed by lived experience as well as evidence.

The government’s recent publication of a 342-page code of practice aims to address these issues by clarifying the legal framework for institutions, ensuring they do not unlawfully compel individuals to disclose or deny their gender identity. However, some public bodies remain hesitant to adopt the new guidance. For example, Lambeth Council, led by the Green Party, has passed a motion rejecting its implementation. Enforcement mechanisms are also a concern, as the Equality and Human Rights Commission lacks sufficient funding to pursue legal action against non-compliant organisations, potentially leaving individuals to seek remedies at their own expense.

Kishwer Falkner, former chair of the equalities watchdog involved in drafting the code, has criticised institutions that continued to operate contrary to the Supreme Court ruling while awaiting government guidance, calling their actions unlawful. The delay in issuing the code, which was reportedly completed in September but only presented to Parliament months later, has been another point of frustration for campaigners.

While some view the code as a positive step toward securing women’s rights to single-sex spaces, others emphasise that it does not resolve the broader societal tensions surrounding gender identity and equality. As the debate continues, the responsibility for enforcement and the balance between opposing rights claims remain at the forefront of public discourse.