Only one that really does it right is Alana and there seems nothing pencilled in at the moment. Ive been to 3 and they've all been good.
External Link/Members Only I know School Girl Kate does them every once in a blue moon but ive never had the luck to catch one.
Ive been to other ones in Northwest, and not so great, last one I went to, only a watcher showed up and a guy, who was as greedy as a tramp on chips. Who wouldn't shut the fuck up "ooh I cant believe Im doing this..." etc and quite obviously didn't know the etiquette.
In my experience, 10 are usually booked, and 1 or 2 turn up. I think Alana's is only popular because she's such a slut and has a decent reputation. Too many gangbang tours seem to crop up in Manchester, which end up generally being a load of shite.
Just my 2 pence....