I am probably wrong but thought that… you should get a NIP within
2 weeks of the offence or you have grounds to reject it.
Although it sounds like you may already have been given a NIP.
Once you have been Notified of the Intension to Prosecute it could
be years before they catch up with you again and it goes to court.
Well that used to be the case.
Don’t ask me how I know, but long ago I changed addresses a lot
and lived abroad for a few years. I’m squeaky clean now, including
my driving licence