Indeed I really do hate that with a passion. If you can't support the car or customer with a standard 3 month warranty then you shouldn't be in the game. It's not hard to do a simple check of all basic items like Tyres, Exhaust, Brakes, suspension, drivetrain and then stick a new MOT on any car regardless of age or cost.
The car Beau bought sold for £3755 so not exactly your average Shed.
When I bought my 3200 I bought from a mate of a mate who is in the trade and I bought from him with no comeback simply because I was getting a great deal on it. That was my choice but there's no way I'd do that from a dealer I didn't know.