Investigators in Germany are probing the role in the VW emissions scandal played by Stuttgart-based Robert Bosch, the large vehicle parts supplier which supplied the software that VW used to cheat emission tests. Bosch say that they were aware that their diesel emission treatment systems supplied to VW could be used to cheat emission tests, but that they were not aware that VW was using them for that purpose, in 11 million cars.

Meanwhile, back in the UK, more stringent and harder to cheat emission tests carried out by consumer group Which? have indicated that 95% of diesel cars are emitting illegal levels of nitrogen oxide and that two-thirds of petrol cars emit illegal levels of carbon monoxide, with one vehicle emitting five times the legal limit, the Hyundai Velostar.