I have a question. The judges were clear that any ruling needs to be "workable in practice".
Let's say they rule in favour of ScotGov. So you can exclude males without a GRC but you can't exclude males with a GRC. No-one can ask to see a GRC, but you can ask to see a birth certificate, which may be altered based on the GRC.
Let's say you run a small lesbian group which usually has around 30 attendees. Women turn up and you let them in without question. Two burly six foot males turn up. One has a GRC and one doesn't, but no-one knows this. You ask to see their birth certificates. They have not brought them. You turn them away.
Can you then be found guilty of discrimination? Or is the burden of proof on the man with the GRC and you're allowed to exclude him unless he proves he is legally female? Does it make a difference that the females weren't asked to show proof of sex?
The same would apply if a male walks into a female changing room in a shop or leisure centre - are staff allowed to ask for proof he is legally female?
I'd like to think that the judges would consider, and perhaps actually explain, how things would work in practice, if they do rule this way.