Here's someting to put a smile on every driver's face. The Crown Prosecution Service has dropped its attempts to prosecute a motorist caught by Britain's busiest speed camera, in a case which may have ramifications for thousands of other UK drivers. Simon Grills was caught by the notorious Gatso at the southern end of the M11 motorway - dubbed Britain's busiest speed camera - after it was revealed it snaps up to 500 speeding motorists a day. Grills argued that, as the sign indicating the start of the 50mph zone the camera enforces was broken, it was unreasonable to prosecute him for breaking the limit. Grills proved that the light on the 50mph sign was broken as long ago as November 2005 - meaning that thousands of motorists prosecuted by the same camera while driving at night may be able to overturn their convictions. Amazingly, the light still hasn't been fixed - although the Highways Agency claim it will be mended over the next few days.