Thoughts...
The SC wasn't making a decision based on what would be fairest or most socially desirable. They had a binary choice (oh the irony!) about the interpretation of certain words in the Act. They weighed up the implications of the two alternatives and chose the one that was (warning: I'm about to use a technical legal term) slightly less bollocks than the other.
This means we are now stuck with 'single-gender entities', no matter how ardently desired by their participants, being against sex-discrimination law. (I'm enjoying the schadenfreude, but at the same time, it doesn't sit that easily with my libertarian side.)
Anyway, here's to secret ballots. And to our male allies applying to join the WI/swim in Kenwood Ladies Pond/whatever, and then suing when they get turned away.