North Star often gives this advice and I often counsel against it. Whilst all that he says is true, unless you intend to reject the Fixed Penalty offer and plead not guilty, you need to be a little bit careful.
Firstly, there are 88 days still remaining for the prosecution to be put before the court. If you take the full 28 days to provide your details and the full 28 days to reply saying you either accept or reject the offer there are still more than 30 days for the authorities to do what they have to do in between those two actions and to start proceedings. Also bear in mind that if you do accept the offer, court proceedings will not be launched and the �six month� rule does not apply anyway. (The rule only applies to court proceedings).
However, the more important point to consider when you take the gamble that the matter will be either overlooked or timed out is this. If you do not provide the driver�s details as requested and in time the speeding matter will be discontinued and a prosecution under Section 172 of the Road Traffic Act (failing to provide driver�s details) will be launched. The six month clock starts ticking again. This offence is dealt with by way of a prosecution in court (there is no fixed penalty provision) and carries a minimum of six penalty points and a hefty fine.
If you are guilty of speeding you are simply delaying the inevitable in the hope that some sort of procedural cods up will ensue. In practice you are the one more likely to be on the receiving end of any cods up.