On R4 You and Yours today - for those who may wish to listen again - there was a bit about some filling stations providing fast charge points. At last, you might say.
And they interviewed an actual punter with a Leaf. Worth a listen. ;-)
One point he made was he charges it at home at 12p per kW.hr. A full charge costing about £2 and taking him about 80 miles.
The fast charge points will cost 50p per kW.hr and only charge to 80%.
So as a rough guestimate 7 quid for 70 miles. Not much different from a small diesel. And, of course, no duty on that electricity, unlike petrol and diesel.