The low mileage is not something that would concern me if the source of the car is credible. [I didn't see what was removed from the posts so I am not referring to that]. I bought my 2006 turbo last year with only 11,000 miles, from an OPC. They do the history & mileage checks before they put their approval / warranty on the car. So I trusted in that. They also did work that was necessary on such a low mileage car, which delayed the delivery. New front pads and discs because they had been sitting too long. New tyres all round after they discovered that whilst the tyres were in perfect condition, they had aged out.
So far so good with it and 2 years warranty whilst I give it a shake down. I could have got a car cheaper outside the OPC network but I wasn't up for considering that.