Not sure about Snoopers but acquired a Road Angel GPS camera detector recently, from Halfords for £400. Knows where the fixed camera locations are and hasn't missed one yet. It also comes with a windscreen mounted laser detector. The GPS accurate to a surprisingly small number of feet. Their website is
http://www.blackspot.com .
The only snag I've found is if you are driving on a road in close parallel to one with a camera, you'll get a nuisance warning. No sweat but the first time nearly gave me a heart attack at three figures on the M25.