Right guys, just a little update, my car has been in the garage for 2 days now. Apparently they done a 'sniff test' on it and came back negative, and because my car wasnt overheating at all they cant seem to find the problem.
So went back to get my car as they seemed clueless, and the total charge was £10.00.... now im beginning to think if they ever done the test as surely its costs more than that?
Anyways, im going to give the guys at jd performance near derby a ring in the morning and see how soon they can have a look. Will update when i know a bit more..