This question does appear quite regularly on the forum, usually in the form of “my Westfield has just failed its MOT on emissions, what do I do now?”. It some cases it appears that an incorrect application of the testing rules has been applied, for example when a car registered on a ‘Q’ plate receives an emission fail, when it should not have had a measured emissions test at all. The ‘Q’ registration situation should be very straight forward as it is clearly established from the vehicle as prese