Question to the Department for Transport:
To ask the Secretary of State for Transport, what estimate his Department has made of the number and proportion of vehicles that were untaxed in each of the last ten years.
The Department for Transport carries out a survey, which since 2011 has taken place every two years, which estimates the rate of vehicle excise duty evasion among vehicles seen on UK roads. The attached table shows the estimated number and proportion of untaxed vehicles in each survey since 2010.