Civil servants are threatening to strike over what they claim is the "segregation" of transgender and non-binary people in Government toilets and changing areas.
Activists in Whitehall's biggest trade union are calling for "possible industrial, legal and human rights challenges" to guidance which had the effect of "segregating our trans and non-binary members in the workplace".
The Commercial Services (PCS) union want to "vigorously oppose" the Government's ruling that transgender women would have to use male facilities.
It followed the landmark Supreme Court decision that the term "woman" referred to biological sex for the purposes of equality legislation.
Civil servants are threatening to strike over what they claim is the "segregation" of transgender and non-binary people in Government toilets and changing areas
REUTERSThe union also oppose "the segregation" of trans women in sport, a subject that is heavily debated within the industry.
The Football Association and the England and Wales Cricket Board are banning those born male from female teams with the aim of ensuring safety and fairness.
Conference believes LGBT+ and women's liberation are connected and that biological sex does not define a person's identity, what they love or what they are capable of.
Later this month, delegates at its annual conference will be asked to agree with the statement that: "Conference rejects biological essentialism and reductionism."
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The announcement comes after the Supreme Court ruled that the term 'woman' in the Equality Act was defined by biological sex
GettyIt adds: "Conference believes any Cabinet Office guidance which prevents trans and gender non-conforming workers from fully accessing their workplace should be opposed in coordination with other civil service unions."
According to the motion, the Cass Review into gender treatment for children used "highly flawed methodology".
They argue this lead to "politically motivated and pre- determined conclusions".
The motion also opposes Health Secretary Wes Streeting's "confirmation of the Tory puberty blocker ban".
Trans activists protesting against the Supreme Court rulingPAA second motion, tabled by a DWP branch in Edinburgh, calls on delegates to agree "trans and non-binary people should have equal access to all services and facilities according to their gender identity".
In addition, it calls for people to "determine their own legal gender without having to endure any costs, invasive medical processes or bureaucratic hurdles".
Despite the PCS backlash, some women's rights groups welcomed the Supreme Court's ruling, including Scottish Lesbians, who told the BBC: "The Supreme Court decision protects the rights of lesbians as same-sex attracted women."
They added: "We're very relieved that our rights have been protected, and disappointed that Pride has once again abandoned lesbians."
