As a former Police Officer and Driving Instructor I have to disagree with Maud. Don't contact the police - supermarket car parks are not covered by the Road Traffic Acts for offences of careless driving etc. In any case the Crown Prosecution Service would never run your case in a hundred years. Their reason would be that it was "not in the public interest" which equals "we don't care and it's too expensive". The circumstances sound like he is a chancer and was simply racing you to the space, and I am sure any County Court Judge would agree with me there, remembering that County Court decisions are based on the "balance of probabilities" rather than the "beyond reasonable doubt" standard of evidence in Criminal Courts. Your best course of action is to repair your own damage, putting it down to experience, and tell him to sue if he dares. He won't! Whatever you do, don't go to a solicitor - they are the only people who will come out with any profit in these cases.