@Darkgreendarkbark You can tell anyone to leave. They can either leave, or appeal to a member of staff. The member of staff is the one responsible - well, their employer is. What they will probably say is "I don't care about this, can you both just do your business quickly and leave the loos".
Whereas if I report a hulking male hanging round the ladies' all evening in fishnets (a situation I've encountered before), it's obvious that a) this is a biological man and b) they are not there because they just need to pee. So I'd hope it's a clearer case for staff to take action.
Why would the staff take action in your case, and not my case?
I want the EHRC guidance to be adhered to. If I reported a transgender man and that man wasn't removed, then that's something I would pursue further.