BTW looks like new grids of speed cameras coming the UK's way, which take average speed from multiple sources so you can't cheat them. Also they don't run out of film like current ones do, so expect a lot more speeding tickets :(
http://www.timesonline.co.uk/tol/driving/article4909662.ece
http://www.timesonline.co.uk/tol/driving/article4909662.ece