On the face of it,it appears to be an ‘on premises’ contract but CHR 15 is wide ranging and Small Claims Court Judges ( who are not fans of used car dealers and tend to side with claimants ) may interpret the law in different ways.Who did you invoice,was it the son,his mother or her brother.Would you be able to prove to a judge that the brother ( a close connected party ) inspected the car on your premises and made the contract after contacting his sister.Also did you establish what qualifications the brother had in order to carry out an inspection.For instance anyone trying out a car on my pitch had to give their name and address and provide their usual signature and if they were ‘ in the trade’ to state where they worked. ( I got caught out on that one once )