So I popped into Primark today and went into the changing room and noticed there wasn't any signage and asked for the women's changing room. The Assistant said it was any gender.
So I'm confused having been in Primark elsewhere I was pleased to notice they generally have 'Women' and then 'Any Gender' separately. I then possibly incorrectly assumed after the Supreme Court ruling that they had to provide single sex changing, but speaking to the manager, it seems not for changing rooms in shops.
So, I just think the whole thing is very confusing - ceiling to floor lockable doors, but not in shops. Single sex changing rooms are not a legal requirement. Wth - it's a minefield.