Another motor show, another Audi e-tron. They’ve been churning them out recently – not just the e-tron SUV and e-tron Sportback, but the PB18 e-tron supercar and the self-driving Aicon. The message from Audi is clear – it’s going in hard on electric and getting in there before rivals. Well, except Tesla. Saturating the automotive airwaves with product means BMW and Mercedes have to work hard to make themselves heard.