Now they're going to ban detectors:
http://news.bbc.co.uk/1/hi/magazine/4333671.stm
But apparently NOT the ones that use GPS to alert of fixed cameras.
Now they argue that the detectors allow drivers to know when they can or cannot speed. I would have thought the ones for fixed cameras have the same effect.
Sounds to me more like they know that the 'mobile' cameras, which are not subject to the visibility guidelines, make such good money they wouldn't want us to find a way around them.
The only reason why the police are so keen to have ever more powers to tackle speeding etc. is because it's one 'crime' where the perpetrators have actually been forced to show their 'id' before they commit the crime. So nice, simply, uncomplicated policing. Just about what woodentops can handle.