I've missed 3 threads they were moving too quickly!
Has Dr Upton actually said it's a protected belief? I.e. that the assertion "I am a biological female" is protected in law as a belief?
If so, that's not true. And it can't be protected as a fact because the law doesn't do this (that's why it's only a belief that sex is immutable, according to the law).
This was a key point I sought clarification on a few threads back, whether it has ever been found in a court that the belief that you have a gender identity that differs from your sex is protected in law following the Forstater appeal judgement (where her lack of belief in it was was found be protected). It's not.
So Dr Upton has no legal protection for this belief.
Yes, Dr Upton is protected by the PC of gender reassignment but that just means that a man who identifies as a woman should be treated no less favourably than a man who doesn't identify as a woman. Ergo, if all men are told that they can't enter women's CRs, this is fair treatment - the PC of gender reassignment and any gender identity belief they may hold are both irrelevant in the fairness of this treatment.