There could be as many as 2.5 million clocked cars on UK roads according to new research.
In a random sample of one million cars, Rapid Car Check discovered that 6.5 per cent showed a mileage discrepancy as part of their MOT history, while 6.05 per cent appeared to have had their mileage lowered at some stage.
The research discovered that, on average, a clocked car has had its odometer wound back by 70,000 miles.