Police: Speeding

Lord Mackenzie of Framwellgate
asked Her Majesty's Government:

How many times police cars have been detected by speed cameras exceeding limits over the past five years; and what proportion resulted in (a) a prosecution; (b) a caution; or (c) no further action. [HL639]

The Minister of State, Home Office (Baroness Scotland of Asthal)
The information is not collected centrally in England and Wales, Scotland and Northern Ireland.