You dont have a clue what you are on about. I have not been in a single pub, bar or club in Brighton, London, Bristol or anywhere else I have been that has CCTV in the toilets. The only things places do to combat cocanie use in toilets is have slanted surfaces, really course surfaces, regular bouncer checks etc.
Plenty of people get thrown out of clubs for posession without the police ever being notified. In fact, I dont think I've ever seen known the police to be notified, even when bouncers have caught people dealing inside.
Besides all that, it would be highly illegal to film people on the toilet, I would have thought that would be pretty bloody obvious.