A Mercedes driver lost his job after causing a nasty head-on crash by going the wrong way down a slip road. Jamie Barnett, 30, from Dover, slammed into a Volvo being driven by Joseph Ormerod, who suffered a broken breastbone and had to spend time in hospital. A court heard Barnett had been at the wheel of a friend’s Mercedes E220 when he drove the wrong way along the A20 slip road at Hawkinge, near Folkestone. Mr Ormerod’s wife Elaine was also injured in the smash, while his car was written off and the caravan he had been towing was also damaged. After Barnett, of Auden Way, was charged with c…