Its gone
Had the Draft verified by the RBS local branch prior to picking the guy up last night.
Bizarre having a trader absolutely delighted with a car and totally unable to fault it, he even had to hand over his "extra" cash as he had no cause to try and knock me down.
Thanks for the advice guys and offers of help, I think I was just being a bit paranoid but still.
He drove away happy, probably until he realised the fuel light came on approx 15 miles down the road.

Judged it to perfection
So the hunt begins for a daily smoker..........its getting a bit cold for a 7.