Just reposting a post I made on the other thread as I believe it illustrates clearly what is at stake with this case:
These closing remarks by BC are, imo, unarguable, are fact and are what the Law says:
Exceptions to s.9 of the GRA recognise the biological reality of sex, because in some cases it's important to recognise the perceptions of other people, e.g. rape victims.
Or in single-sex spaces, someone who will appear to women, other women, to have male anatomy. Women are entitled to decide who sees them naked, who touches them etc.
C doesn't deny people's rights under the GRA. She is happy to recognise them; endorses the principle that T people should not be discriminated against or harassed. But she doesn't accept that they must be treated in every situation the same as biological women.
That's on all fours with the current state of the law. And it's so even if it upsets people.
It doesn't need to be on all fours with the law to be protected. It's a protected belief that gay people shouldn't be allowed to get married. It will upset some people, but it's protected.
If it were the test, people on the other side of the argument who say trans people should be allowed to access all single sex spaces would fall foul of it.
Once more loudly for those at the back:
Women are entitled to decide who sees them naked, who touches them etc That's it, WE decide.