What distinguishes the BBC from the rest of this country's media? Perhaps the most important factor is its editorial guidelines, which are supposed to ensure that the corporation achieves the highest standards of due accuracy and impartiality and strive[s] to avoid knowingly and materially misleading our audiences." Woe betide the producer or presenter who breaches these guidelines. Unless, that is, they work for Top Gear. Take, for example, Top Gear's line on electric cars. Casting aside any pretence of impartiality or rigour, it has set out to show that electric cars are useless. If the facts don't fit, it bends them until they do. It's currently being sued by electric car maker Tesla. Now it's been caught red-handed faking another trial, in this case of the Nissan LEAF. Last Sunday, an episode of Top Gear showed Jeremy Clarkson and James May setting off for Cleethorpes in Lincolnshire, 60 miles away. The car unexpectedly ran out of charge when they got to Lincoln, and had to be pushed. They concluded that "electric cars are not the future". But it wasn't unexpected: Nissan has a monitoring device in the car which transmits information on the state of the battery. This shows that, while the company delivered the car to Top Gear fully charged, the programme-makers ran the battery down before Clarkson and May set off, until only 40% of the charge was left.