Female students say they are still sharing toilets and changing rooms with biological males, despite a recent Supreme Court ruling on the legal definition of a woman.
Several women at UCL, speaking anonymously due to fears of being vilified by colleagues, say the institution has continued to allow trans women to use female facilities.
They are concerned the university has not reviewed its policies in light of the recent judgment.
Other universities including Edinburgh, Southampton, Bath and Nottingham have also yet to publish updated guidance on the issue.
Earlier this year, the UK Supreme Court ruled that a woman is defined by biological sex under equalities law.
Less than two weeks after the ruling, the EHRC stated that in public spaces, such as hospitals, shops and restaurants, “trans women (biological men) should not be permitted to use the women’s facilities”.
Whistleblowers at UCL claim the university is waiting for further clarity on the practical implications before making changes, according to the Daily Mail.
One reportedly said: “Bear in mind how many female students we have and will have from religious and cultural backgrounds.
“Their parents have no idea that their daughters could be forced to share toilets and changing rooms with men.”
Another added: “It undermines women's dignity and privacy.”
The university's guidance states: “On campus, trans students can use "men only" or "women only" changing rooms or toilets according to which one they feel most comfortable in, or that they feel is most appropriate for them.”
UCL and Bath said they aim to foster an inclusive environment, but are waiting for updated guidance from the Equality and Human Rights Commission (EHRC) before making any policy changes.
A UCL spokesperson said: “We are committed to fostering a diverse and inclusive community where staff and students can engage in open discussion in a climate of mutual respect and tolerance.
“We recognise that issues around sex and gender identity are deeply personal and often complex.
“Following the recent Supreme Court ruling, we are reviewing our policies carefully and awaiting updated guidance from the Equality and Human Rights Commission.
“A facilities audit is also underway to ensure our estate meets the needs of our community, and any guidance that may need to change is clearly marked ‘under review’.”
Despite the Supreme Court ruling, the EHRC — which is responsible for the enforcement of non-discrimination laws in England, Wales and Scotland — states that trans people should not be left without any facilities to use.
In a statement, the EHRC said it had released the guidance because “many people have questions about the judgement and what it means for them”.
The EHRC said: “If somebody identifies as trans, they do not change sex for the purposes of the (Equality) Act, even if they have a Gender Recognition Certificate (GRC).”
“Employers and other duty-bearers must follow the law and should take appropriate specialist legal advice where necessary.”
To avoid discrimination, the EHRC states that “where facilities are available to both men and women, trans people should not be put in a position where there are no facilities for them to use”.
Where possible, the EHRC said mixed-sex facilities, such as changing rooms, should be provided in addition to sufficient single-sex facilities.
