“All cars sold in the UK undergo an official test under EU law to ensure they meet the latest emission standards. The testing method employed by Which? is very different from the official EU test, so it is no surprise it delivers different results.
“The existing test is a laboratory test and was never designed to reflect the infinite variations of ‘real world’ driving. New technology now means the test can be changed to make it more representative of what consumers experience. However, given the huge differences in temperature, road and vehicle conditions as well as driving styles, no test can ever replicate exactly what happens on the road all the time.
“Industry wants this new test in place as soon as possible but it must be robust, credible and repeatable – the benchmark of any objective assessment.”