Got to say that's the first time I have ever heard any one having to pay for repairs to a car they have traded in to a dealer! If your mate is not into face to face confrontation then citizens advice and small claims court is prob his best bet . Might take a while but should get a positive result . Surprised you not had the usual keyboard warriors all over this thread telling you to burn the garage down and kidnap him . Or how they would have been down there with the boys and the baseball bats ha ha . Good luck to your mate anyway I hope he gets his money back .