You may not have heard of Range Anxiety. It is the worry that your electric car could run out of juice in the middle of nowhere, with not so much as a habitation on the horizon, let alone a recharging point.

It's also, apparently, the main reason why we're not all rushing to trade in our air polluting cars for nice clean electric ones.

We feel uneasy relying on battery power, no matter what it says on the gauge; it's one of those modern anxieties that – reasonable or not – lurks below the surface, slightly ruining our ability to