Bring the Science to Court. Terfs Cannot Win It.
This is a call to action for every transgender person, every intersex person, every gay man, every lesbian, every bisexual person, every non-binary person and every ally who has watched the law move in one direction while the science points firmly in another.
Document everything. Date everything. Keep every record.
Here is why, and here is what needs to happen.
What the Supreme Court Actually Ruled
The Supreme Court ruling in April 2025 determined what the word sex means within the specific language of the Equality Act 2010. It made a statutory interpretation. It did not hear expert testimony on embryological development. It did not examine the neuroscience. It did not consider the genetic research. It ruled on legislative intent and the meaning of words in a piece of legislation.
The scientific argument was never tested in that court. The ruling is legally reasoned but scientifically uninformed. Those are not the same thing. Science does not change because a court ruled differently about a word in a statute.
What the Science Shows That the Court Never Heard
Biological sex is not a simple binary determined at birth and fixed permanently. This is not opinion. It is the documented conclusion of decades of peer reviewed research published in Nature, the Journal of Clinical Endocrinology and Metabolism, Nature Reviews Neuroscience and other major scientific journals.
The genitals and the brain develop in separate windows in the womb on different hormonal timelines. These are distinct biological processes that can produce different outcomes in the same person. That is the documented basis for transgender identity. It happens before birth. It is influenced by genetics, hormones and developmental biology. There is no proof that social environment after birth has any effect on it.
Over one million people in the United Kingdom alone are born intersex, with chromosomal, hormonal or anatomical variations that do not fit the binary the ruling assumes. Some are born with both a penis and a vagina. Some have chromosomes that are neither XX nor XY. The binary the law has now enshrined does not describe the biology. It never did.
This evidence was not placed before the Supreme Court. It needs to be placed before a court that has to engage with it properly.
This Does Not Only Affect Transgender People
This is the part the community needs to understand clearly.
The EHRC guidance does not only affect transgender women. It affects every person whose appearance does not match what a loo attendant thinks they should look like. Butch lesbians being challenged at the door of women’s bathrooms. Transgender men with beards being directed into women’s showers. Feminine gay men being questioned. Androgynous people being stopped. Anyone whose body, presentation or existence does not conform to a rigid binary being required to justify themselves to a stranger.
The guidance was written for a simplified version of humanity that does not exist. The real world contains 8 billion variations of human being. The law has drawn a line through that complexity and is asking venue staff to enforce it based on visual assessment.
That is not clarity. That is subjective judgment handed to whoever happens to be standing at the door.
The same logic being applied to transgender people was applied to gay people in the 1980s. Predators in bathrooms. A threat to children. An unnatural lifestyle that needed to be stopped. Section 28. Military dismissals. Adoption bans. Every single one of those arguments is now being recycled word for word against transgender people. The community that fought those battles needs to recognise what is happening and understand that this affects every one of us.
Where the Legal Challenge Lives
A human rights challenge under Article 8 of the European Convention on Human Rights, the right to private life, is the most viable route. The argument is that policy flowing