To answer a question you may have wanted to ask they have six months to issue a summons from the date of the offence. I imagine you'd normally hear long before that
The last one I got (over 12 months ago) arrived by ordinary post and it was at least two months after the date of the 'offence'. Ignoring the notice - as if you hadn't received it - doesn't help; the process will just roll ahead and get worse anyway on the assumption that you did receive it. There's no way to 'make it all go away' although I know one person who claims that he has postponed everything (getting banned in his case) by replying within the time limit but with a cheque for slightly *more* than the amount specified, which (he says) meets the requirement to pay but gets the file put in a pending tray for a long time.
Posting is normally considered proof of delivery. If you state that you never received it you are asked to swear that you never received it in front of a magistrate.You'll appreciate lying at this point is a serious offence carrying a much higher penalty than the speeding offence
The CPS then start the whole thing over from scratch so you haven't gained anything but time
I think it is 6 months. Am afraid almost all get sent in time. But you might be lucky, cus my brother got caught doing a speed that would have resulted in a big ban. However, he didn't get the court letter in time. Instead they sent a letter admitting their mistake, saying he had got away with it!