So the battery charging costs are on top?

Remarkably (although I'm sure things will soon change), it only costs £10/year membership to use the London EV on-street/public charging network - with no additional charge for electricity:

https://www.sourcelondon.net/membership

Even so, the main problem seems to be that EV's are most use if you live in the inner city - where you're least likely to be able to park in your own driveway to charge-up.

(I wonder if anyone's collecting up car-full's of free electricity, taking it home, and dumping it into their feed-in tariff?).

As your pricing example points out, EV's are *nearly* there, and the Renault pricing deal will be enough to bring-in more early adopters.

I've also heard plans for retrofit conversions to existing street lighting for add-on charging points. I suspect roll-out of public charge points will soon become the choke-point for inner-city adoption.