Here is some more info for anyone thats interested from the company that makes the SPECS system.
http://www.speedcheck.co.uk/specs.htm
and for a list of SPECS sites
http://www.speedcheck.co.uk/map.htm
Although these systems get right up my nose the use of the speed camera signs without a camera actually present really pisses me off. The legislation was altered to prevent this from happening but appears to have been circumvented by the use of mobile "safety" cameras. The signs now relate to an area where speed monitoring may take place from time to time. In addition, why in roadworks do they paint the cameras the same colour as the trillion other roadworks signs?
We all know that you break the limit you break the law, but just as driving past a school at 3:30 in the afternoon at 30mph is way too fast, driving at more than 70 mph on a straight motorway with virtually no traffic around is almost causing an obstruction.
The association of british drivers has some info on the statistics and a useful info plus an audit form if anyone has been done recently.
http://www.abd.org.uk/