The situation wasn't as dire as I thought. I believed that water sits on instead of under, as with oil.
You are right, it is amazing how little water is needed. The nice thing about an electric pump is that it pumps! I took a few samples and the water has dropped from about 15mm to very little but the petrol looks cloudy.
Now the engine runs but is a little rough (after embarrassing me at the top of the road, fortunately I could roll down the hill).
The water could only have got there from the petrol or condensation. Usually I fill the tank right up before leaving it to minimise condensation. Would putting E10 in help to reabsorb the water?
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