Glad I could help :)
just to add my personal experience, the last 5 cars that have been bought by my family including m, my wife and both my parents have cone from main dealers as approved used. The last 2 cars bought from independent garages cost alot more in repairs as more things went wrong with them.
Well the theory was, buyer's wanted 4x4 for winter conditions (ie snow and ice) and in the spring/summer buyer's wanted convertibles. There maybe some truth in this but it's less obvious now due to the popularity of SUVs.
Cheers
Steve