Trevor - agree wholeheartedly. Whenever I'm scouting for a used car, the seller is always very keen to let me take a test drive, but I always say, 'No - you drive'
That way you can soon tell what sort of abuse has been meted out.
I noted that Mick Jagger's old yellow 1968 Plus 4 was up for grabs recently. That bloke is amazing IMO, but it doesn't make his car worth any more to me.