Do the AA still offer a service where they check a potential new car for mechanical defects? A potential buyer for my Discovery had this done years ago and it included a check for being stolen or being an insurance write-off. The check was extremely thorough and the mechanic found that the crankshaft pulley was loose and would have resulted in catastrophic failure if not rectified. I hasten to add that the car drove perfectly and I had no idea of the fault, which had been caused when Land Rover did an engine change for an unrelated problem when the car was just a few months old. The check (which cost around £50 IIRC) potentially saved the buyer £1,000s.
For those needing closure, the story had a happy ending. Land Rover accepted that they were responsible for the loose crankshaft pulley when the engine was changed and fixed the car for free. The prospective purchaser was happy with Land Rover's response and assurance that the car now had an engine 'as good as new' and went on to complete the sale. We exchanged £16,000 in cash in the car park at Stanstead airport which, in retrospect, probably looked like a dodgy deal had anyone noticed!