Brian:
Tesco to home then as far as Lidl behind you then a quick turnaround as the "penny dropped" cos it was misfiring a bit.
Thanks all for the helpful suggestions.
Just phoned Nuffield and went to answerphone. I'll try again after 9 in case they're in.
My car is 7 years old but it's only done 30,000 miles so I'd better pay the money with the least risk to Engine & Injectors I suppose.
IAM a knmxfgnvhbdbvhjhdfjh!!!!!*&^%$£^%^%$£$%$%