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Having read so much about it, I knew instantly that it was a coil failure. Was flooring it up to motorway speed, then slipped it in 5th and all of a sudden the engine note changed dramatically!
I started with the centre coil on the front (closest to boot) bank and then tried to one to the right. Fortunately it was this one, so only took 2 tries!
Even though I'd been shown how to undo the coil power clips I struggled a little as I was afraid to break it.
Got it right in the end! Problem was that I was on my way to a car event that I was running late for!