Thank you for posting that article. It is excellent. The ideas are conveyed very simply and clearly.
I saw underneath the point made by pro-Self ID that self ID would not change the Equalities Act which says that trans people can be excluded from single sex spaces.
Why is the Equalities Act not used more often in practice? Why are rape centres, changing rooms, sports, lavatories, girl guides, short lists, not in practice allowing women-only spaces?
The only public body seems to be the Girls Day School Trust.
I am not sure about hospitals.