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@markrjohnson
EEC regs and construction and use require a vehicle speedo accuracy of plus or minus 10%. Inevitabley they read high. No manufacturer wants to be sued by motorists who have been done for speeding because their speedo lied.
This is why ACPO guidelines for the reporting of speed offences (and GATSO'S) state 10% +2 mph.
So 35 in a 30, 46 in a 40 etc etc.
This is also why you can get stuck behind some numpty on the M way who is apparently doing 65MPH (according to your speedos), his could be reading 75MPH leading him to think you are the numpty as he is already over the limit.
And, as has been stated, you can't be done for speed on a vehicle that is not required to have a speedo.