The figures about reduced mileage were revealed as a result of Freedom of Information (FoI) request to the Vehicle and Operator Services Agency (Vosa).
They show that in the year to March 2010, the recorded mileage on MOT certificates for 669,127 cars had dropped compared with that recorded on the previous certificates issued 12 months earlier.
**There was a similar problem with 26,512 motorbikes ** and 19,224 delivery vans.