Indeed! at my renewal I 'confirmed' our annual mileage as 6000 miles, and the insurance salesperson replied '... but you did 7500 miles last year!'. Ooops - embarassed and lesson learnt.As an FYI.
If you go onto the government MOT website and put in your numberplate you can see exactly how many miles your vehicle has done between each MOT.
And if you can do it easily, so can the insurance companies.
So don't think for a second that you can get away with under reporting your annual milage!