A man who used illegal blue lights to overtake other cars by appearing to be a police officer has been convicted of causing a serious crash. Joshua Pembrocke, 24, was driving his Peugeot 208 in Cambridge Road, Great Shelford, when the collision happened at just after 5.30pm on 7 April. He had a blue LED bar installed in the windscreen of his car with forward facing blue lights, of a similar style used by emergency services. Many motorists had pulled over or moved out of the way of Pembrocke’s car, believing it to be on a blue light response. However, as he overtook cars at speeds of up to 50mp…