I have also been aware of it being offered in Sheffield parlours, namely Classic Touch, Kittens and Lizzy's. Although Lizzy's, and Bluebelles if I recall correctly, it wasn't so much the receptionist as such, but if they'd been quiet and there were only a couple of girls on, the one who hadn't been chosen would sometimes offer to come in for a tenner and take her top off or whatever. This occasionally developed into more, like once at Lizzy's (or had it already become Dolly's?) I was in a grapple with Faye, when Shelley (calling herself Katie at that time) invited herself in, joined in, and I ended up getting a BJ off both of them together, no extra cash changing hands, but Shelley was always game!

(Probably still is, but she's past my maximum age these days

)