Just to follow up I have driven the car for a couple of days now, not a great distance and still all dots illuminated on the fuel gauge. The problem seems to have sorted itself out and idling at all stages of motor warm up seems to be back to normal now. No more spluttering and cut outs. Interesting thought on a possible bit of water contamination. I always buy the most expensive (highest octane) fuel from the same company and get it from the same servo 99% of the time. I did however get this last tank from a different servo. Perhaps their fuel was a bit water contaminated?
