Bought the car. Seems okay. They are high mileage motors, as ex-lease hire My car was an ex Chubb car. Mine had done 97,000 with full service history, and just had the main service undertaken. They MoT'd the car, put new tyres on the front as these were down to 3mm and taxed for 6mths. So far I'm happy. As you would expect the cars have a few issues (nothing major, actually very minor) due to the mileage they have done.
Price wise, I couldn't find a comparable car cheaper after looking for three months. Visited some dealers in Doncaster and the sales people were shockingly bad. The gentleman I dealt with wasn't pushy in the slightest, I test drove a couple of cars, to get the feel for what I wanted.
If I do get any issues I'll let you know.
As for the owners, never dealt with them, and I've yet to come across a second hand car dealer that people don't class as 'dodgy'.