I helped drive this record-setting EV across Britain on sunshine alone – and the 870-mile trip cost absolutely nothing

Driving the length of Britain is an expensive endurance test that isn’t overly kind to the environment, but this week I helped do it for free, minus the emissions. A standard Renault 4, the kind of car parked on any suburban street, has covered the circa 870 miles from Land’s End to John o’Groats without taking a single unit from the grid or burning a drop of petrol. Every electron came from the sun. The same journey in a petrol car works out at £120.48 in fuel (around $160 / AU$230), or £240 there and back (about $320 / AU$460),…