Thanks for responses, after reading Brian's suggestion and taking a closer look at the plenum damp could be the problem. I had the car into a T4 in St Albans who cleared the faults and tested the car for about 10 miles with no problems before my recent trip but they did say the ECU board had slight areas of corrosion, but not anything that looks worrying.
I will PM Brian re having the ECU checked out.
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