On 23/01/2015 12:10, Tim Watts wrote:
I think if I received such a letter I'd write back and request the
calibration certificate for the speed device and confirmation that the
operator *at that time* was certified competent to use it.

If I write to Mr Plod, and say I wasn't exceeding the limit by _that_
much - well, shall we say I chose discretion?

Andy