AFAICT (but IANAL) they've got six months from the date of the alleged offence to lay papers before the court and the summons is usually dated soon after the date on which the papers were laid. So ...
Alleged offence was on 1 Oct 2006, which means that papers must be laid before 1 April 2007 otherwise it's timed out and you cannot lawfully be charged. I suspect that your best course of action is to get over to
PePiPoo, sign up for the Fight Back forums, complete the NIP Wizard, and ask on there for advice. That said, I suspect that will be to find out from the court the date on which papers where laid and if the case has timed out to take the necessary action to have it dismissed, cancelled, or whatever the proper term is.
If they've filed within the allowed time, you'll then need to address whatever the charge is. If it's speeding, you're probably in the clear if you keep your head unless they have evidence it was you. In most cases, their only evidence is your confession resulting from an S172 "request" - and you say you haven't identified the driver. If they're charging you with failure to identify the driver, get over to PePiPoo. Morally, I don't see how they can punish you for failing to answer their request when you haven't actually received it - but the law can be funny about things like this so I could be wrong.
Again, IANAL - so please ask on
PePiPoo.