It came as no great surprise to learn that the EU competition authorities are crawling all over the three major -German car-makers, Volkswagen, BMW and Daimler, to investigate collusion via ‘secret technology working groups’ dating back to the 1990s. The most damaging allegation — reported by Der Speigel — is that the three groups colluded over the use of AdBlue, an additive that neutralises -diesel emissions, by agreeing to use small but inadequate AdBlue tanks in their cars when larger, more expensive ones might have done the job properly.