*"Your answer does suggest you see the value in single sex provision. Can you not see that it becomes mixed sex provision the moment a person of a different sex (as determined by their sexed body) enters it."
The question is how do we map sex which these days is definitely not binary onto male and female spaces? There quite simply isn't the sort of simplistic split some people on here want. Human biology was always too complicated for that; modern medicine has made it more complicated and medical advances over the next 20 years will just make that much more so.
So single sex is a fairy tale. It's now about the best possible compromise. And for me that is Self-ID.*
For me -
The way people feel is complicated.
Sex is binary.
Intersex is a muddle of genetics, misused by some to validate whatvere they want.
Gender is a nebulous and insidious black hole.
Self-ID is the most nebulous way of defining anything and therefore the worst possible compromise.