I have just spoken to the Garage about this and the bottom line is I should drive it untill the problem gets worse or logs a code so they can fault it. When it went in you couldn't pull away from start with out limp mode and engine light. I suppose 2 mins of slight misfiring in otherwise perfect 300 miles is quite intermittant but it is just very confusing as to what the problem is as all the plugs and coils were changed.
I can't see how something else could be at fault when changing the plugs and coils seemed to fix it instantly (apart from the 2 mins) from what was basically undrivable.
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