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Close the question please.
Hi Matt, thanks for what looks like a very comprehensive answer. I've been suspecting it's a fuel problem, but I'm no expert! My hubby says doing all this himself is outside his comfort zone, but I will certainly print this out and present it to my Skoda dealer (the car is still under guarantee), as they just say they can't find anything wrong and don't seem inclined to think it through as you have.
Not at the moment thanks. I'm logging each time it happens and will soon go to discuss it with my garage, with a copy of your suggestions, and book the car in for them to have another look. If this doesn't help, I'll get back to you.