Well you guys know your stuff - I've just taken it for a short drive (2m) to get petrol. It was pulsing even whilst the engine was warming up... pulled in to the petrol station and the revs dropped to normal steady idle.
I guess it was just damp somewhere in some sensor given the rain we've had over the past few days, and the fact that its last run was so short. I'll let the car cool and re-start it again, and as suggested, let it warm up before turning it off.
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Malcolm
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