Buying a second-hand car...
aside from the obvious (to me!) places like Autotrader and car-giant, are there any good places to look for a quality second-hand car?
Baby no2 is on the way, and while public transport was an option with one child, no car with babba 2 will mean we never leave the house! I'm looking for an A4/A6 Avant (both 2.0 diesel 2009) or a 520d estate. I expect to do very few miles (about 6000 annually) so I can go for something with slightly high mileage on the assumption that, come sell-on time, I'll have dragged down the average mileage!
Any views as to where's good to look?