Two interesting things happened last week. One was Tesla’s delivery of the first batch of its Model 3, the company’s first “affordable” car. (If you think $35,000, about £26,500 – is affordable, that is.) The second was a “diesel summit” held in Berlin, a meeting where the bosses of Germany’s leading car manufacturers (VW, BMW, Audi, Ford, Porsche and Daimler) got together with ministers to ponder the industrial implications of the emissions-cheating scandal and the