A friend of mine is a mechanic and recently done a private job at his work out of hours,which was all arranged etc. whilst doing the job (new clutch) the head gasket blew and now the car is "knackered" , this was all explained to the person who's car it was and now they are trying to say that the mechanic broke it by ragging it up the road and are now taking him to small claims court. Can they do that?

