To be clear, which grounds did you select on the TE9?
The ball is now in the council's, as opposed to the county, court!
Your timetable is incredible.
You filed your WS on 1 Sept and they responded on the same day but posted on 3rd.
Unheard of.
But it's history.
The council must serve a further NTO if they want to proceed. I suspect they won't, because addressing the previous one to your old address was a procedural impropriety of enormous proportions.
But time will tell.
While you're waiting, what does their website say? As I understand it, the council is notified electronically and therefore has had ample time in which to reduce the PCN amount to the full penalty.