You cannot discriminate against men without trans identity to allow men with trans identities in.
that's the ruling in a nutshell.
And the bit about lesbians, of course.
but the pushback you get is, you don't even know we're in there, or you can't stop us because it's not policed, or you'll lose all your provision if you enforce that, and everyone else agrees with us (despite the violence, moobs, pissing and, er, photos).
unfortunately for them, the jig is up.
See Robin Moira Wright actually in the House of Commons and the apology to the women whose toilet it is