There is James at youtube Chops Garage he seems to sell cars even older models and seems pretty fair going out of his way to help his customers which is a bit rare nowadays. His ads are C&G Car Sales he is in north devon but he has many traveling from london and afar to sell their cars to him and buy, and no I mainly support Motability you have piece of mind. As with any new or buy yourself motor it is a matter of luck if you get a good car with no problems but as we know if you do not have the money to pay for repairs which can be huge depending on the problem and with the labour rate very high I really over the years was lucky when buying my cars as they used to be new and low mileages but you need the money or warranty to back up used cars. I also think there is Geoff’s Cars he is on youtube.