The UK’s largest ever class action court case is due before the High Court, hoping to reveal how many diesel cars have been using illegal devices to cheat emissions tests. It comes a decade on from ‘dieselgate’ - the 2015 scandal Volkswagen admitted as many as 11 million of their cars had ‘defeat’ software to manipulate the tests. New analysis shows there are still 9.8 million diesel cars still on the road in total. These models emit 70,300 tonnes of excess Nitric Oxide and Nitrogen Dioxide (