Sometimes it's locked at night, other times it isn't. Doesn't seem to be rhyme or reason as to when they do it.
Looks like the existing one's closed again now, didn't last long.
Found one on the weekend in a male toilet between two cubicles. Due to the location it's naturally aimed toward MM, but I'm sure there's plenty of straight or bi males that would be happy for it to be MF if the opportunity was there. Don't want to post location publicly as it could get shut down quicker, feel free to PM for location though.