Probably out of an auction or part-ex. Probably cost the bloke £400-500 and he wants to double his money. Would never buy a car off the road-side. I can drive down 4 roads in Hull and find 40-50cars for sale with a4 typed for sale ads, all these cars are aimed at the migrants coming over from Poland, latvia, lithuania and Slovakia who come on the P&O ferry every morning.
If you want a Rover 200, there must be plenty of older retired drivers running these vehicles as they were popular with the 'mature person wanting a patriotic British Car', just ring round the local paper adverts and when you get an older voice on the phone then that's the one to go for!
Rob H