Well that little nugget managed to slip by most of the mainstream UK media! whether by design or by accident I'm not sure. The fightback begins! Great to have something going in the other direction for a change even if it's just a small win.
I would say though that the judge is wrong, it is absolutely discriminitary to forcing trans staff members to use a trans bathroom as it could out people who did not want to be outed or alternatively if having to use disabled facilities (which is more likely) resulting in trans people being viewed as disabled.
Also, the the trouble is, unless it's highly publicised it won't stop the public getting riled in the public bathrooms.
UK law often throws up bizare technicalities like this. Crazy system at times.