We make a terrific fuss when a new Harry Potter blockbuster rolls out, but how many of us will be still be watching HP and the Deathly Hallows 1 (or 2) in ten years time.

Chances are, however,that you, or someone in your family or someone you know will be driving or aspiring to drive an electric car by 2020.

So remember, it all started today, when the Nissan Leaf, the first mass marker electric car, was officially launched.