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There's also approximately a 5% tolerance in your speedo and in electronic components and extremes of temperature can also affect adjustments, which is why speed detection equipment should be calibrated on a regular basis. There's also evidence that police routinely misuse handheld equipment and that some of the devices used can be very easily mislead, so your speedo may indicate that you're under the limit, but the misused/easily fooled handheld device says you're not and they'll chance a fine.
Wasn't it a welsh policeman who, for fun, pointed a hand held radar gun at an RAF jet fighter in recent years doing low levels round the valleys in order to see what speed it was doing?
The weapons system on the plane perceived a threat, armed and but for the pilot jamming the device and de-activating the weapons system, the policeman would have been blown to oblivion!
The sequel to that was the Chief Constable wrote to the commander of the RAF station complaining that the hand held radar device which was jammed no longer works and claiming the cost of another! The commander told him to recover the cost from the savings achieved by not having his officers attend a "state" funeral of their otherwise "fallen" comrade!!
