Steve Coogan not guilty of speeding at Hove seafront declares the BBC 16th July. In fact, it appears that he was found not guilty of the offence of failing to supply information under section 172 of the Road Traffic Act 1988. This is not a speeding offence though the request for information related to a vehicle alleged to have been speeding.
Section 172 (Duty to give information as to identity of driver etc in certain circumstances.) is, in essence, a finger-pointing provision. The section was considered in the recent case of Lynes v DPP  EWHC 1300 (Admin) - McCombe and Hickinbottom JJ.
A speed camera does not identify the driver,
only the vehicle. However,
every vehicle has to be registered with the
DVLA under the provisions of the Vehicle Excise and Registration Act
1994 and regulations thereunder. The details to be registered include
those of the keeper and that keeper's address. Section 172 of the Road
Traffic Act 1988 lays down a procedure for obtaining information about
who is driving a vehicle at any particular time in relation to a number
of offences, including speeding.
This has been a troublesome section which has spawned a considerable volume of case law. Lynes v DPP is useful since the judgment draws together a number of those cases.
There is often considerable confusion as to what the section is about - as I believe is demonstrated by the reporting of the case against Steve Coogan - BBC 16th July. Section 172 is concerned only with failure to supply information. It is NOT a speeding charge though section 172 notices are most commonly used in relation to speeding offences.
The section itself contains defences.
172(4) - A person shall not be guilty of an offence by virtue of paragraph (a) of subsection (2) above if he shows that he did not know and could not with reasonable diligence have ascertained who the driver of the vehicle was.
172(7) - A requirement [to supply information] may be made by written notice served by post; and where it is so made -
(a) it shall have effect as a requirement to give the information within the period of 28 days beginning with the day on which the notice is served, and
(b) the person on whom the notice is served shall not be guilty of an offence under this section if he shows either that he gave the information as soon as reasonably practicable after the end of that period or that it has not been reasonably practicable for him to give it.
The internet is replete with solicitors advertising their services in relation to this section.