Thanks for the reply Muff i'll have a go at that. So the car went to my local garage where they couldn't find any fault codes and said the car was running fine. So i went and picked it up and it ran perfectly.... untill last night.
So last night i came back up the m6 and once again, turbo seemed to cut off, hardly any acceleration or power, but still drove and happily sat doing 70mph.
Pulled off the m6 down to a roundabout and it then wouldn't accelerate at all. Engine still running but the accelerator pedal would go flat to the floor and not rev the engine at all.
Hazards on...... turned it off thinking it was an RAC job. Turned it back on..... brilliant everything back to normal?!! Got home on full boost. Very strange.
So i'm going to say an electrical fault any idea of any sensors or valves that would cause this but not through up any dash or warning lights???