Seems pretty clear in that article that it was taken down because the organisation who commissioned it were reported as a transphobic hate group who spread propoganda and hate-speech. He even says, "look beyond what meets the eye" - as in, look beyond just the words on the Billboard.
Let me just remind you of one pertinent fact. The Home Office maintains a register of hate groups. No woman's group is on this register. None will go on that register based on what they are saying:
"Men cannot become women"
"Women don't have a penis"
"Women's rights matter"
"Women's sex-based rights are under attack"
"Females have a right to define themselves - in language and in law - in a category separately from males"
"Transwomen are not women"
"Woman means adult human female"
"Gender reassignment surgery on children is illegal and should remain illegal"
"A frock does not a woman make"
"Woman is not a costume"
"Woman is not a performance"
"Male violence is the biggest threat females face"
"Transwoman are male"
"Transwomen commit crime at the same rate as all other men"
"Women have a right to have things that exclude males, like sports or scholarships or refuges"
"Gender ideology is harmful to women and girls"
"There is no ladybrain"
"There is no such thing as a gendered soul"
etc etc
These words are not only true in the sense of accurately representing material reality, these words are also neither hateful nor are they inciting hatred or violence - both as defined in law and in and of themselves.
Freedom of Thought, Freedom of Expression and Freedom of Assembly apply to women who want to think these thoughts and who want to meet publicly to express them.
So, while I have no idea where Standing for Women stands legally in terms of the breach of contract that taking the poster down represents if the billboard company does not refund them, I'd give a court case a better than even chance to be won by Standing for Women.
Companies providing a service are not allowed to discriminate against people with a protected characteristic as they seem to have done here. The company cannot prove that Standing for Women is a hate group which they would have to do to justify breaching the contract.
Not that I expect Standing for Women to sue. That £700 was money well spent in any case - you couldn't have paid for that kind of exposure of the situation women find themselves in.
I peaktransed someone in record time today and I expect this to continue. No matter how much the line is pushed that this poster was transphobic, most people just don't agree. As my now peaktransed friend said: this proposal is taking it too far. And the banning of meetings and posters like that makes proving that it has gone too far very easy. Two minutes. Is all it took. So I'm going to give all of the women I know this exact same brief talk. Let's see how many of them agree with sex self-identification.
And I feel I should really thank all of the self-id campaigners and men's rights activists who keep coming here and telling me I'm a bigot and a transphobe and aggressive and hateful. Because I am channelling my anger about these baseless accusations and turning them into action.
Thanks for showing me the hill I'm actually prepared to die on. Not something I ever expected to happen. Not after nearly 50 years of avoiding political strife and hiding in the background. I'm going to be loud and proud. From boring housewife to radical feminist activist.