So it transpires that there is also another error on the roadside ticket..
The offence is stated as "exceed 70" but the offence code (1505) is apparently for "exceed 60 mph on a single carriageway during a temporary speed limit order" Seriously, had this cop been smoking the wacky baccy?
Spoken to the ticket office, solicitor drafted letter on it's way to them, stating that the offence detailed on both the roadside ticket, and posted letter never happened, and indeed could never have done due to the offence I was reported for. They (ticket office) told me on the phone, that they have to refer it back to the cop to see if he wishes to proceed. I am assuming he can't change the ticket he wrote, so we'll have to wait and see what happens next..
Mike