Thanks everyone. Your thoughts are mot inconsistent with my own thinking. To clear up a few points:
1. Sorry about the reproduction of the NtK. I scanned and then tried to upload as invited below the dialogue box when writing the post and it was rejected on size grounds. Has the site as a whole reached a capacity limit? I have not had this issue before on FTLA and thought it a bit of an advance on Pepipoo.
2. Imgur and tinypic seemingly will not accept a pdf which is the format in which my scanner scans. Therefore I had to take a photo on my mobile to upload via Imgur and as I said the font size was tiny in the first place so a bit difficult to read. I am not the greatest techie so I may have missed something here.
3. The third photo I posted shows the locale but not the positioning of the signage. Suffice to say it is pretty clear. One is on a pole just in front of my motorbike (side on in the photo) and there are two on the walls of the shop either side of the door which is the second "brickwork" photo. Can't really complain.
4. "The driver" just didn't really look at the signage nor take note of the time when she parked the car as she "parks there a lot". She checked it when she returned.

Bit late then. The 1 hour limit is a red herring - it looks from GSV as though it had been an hour and is now 90 mins. Either way she exceeded it.
5. The NtK does follow the wording of Part IV para 9 pretty faithfully so I don't think there is a POFA angle. Nor is there any doubt about location of the relevant land, both of which were very much not the case in St Michael's Court and why I fought that one all the way until poleaxed by an incomprehensible decision by the arbitrator who let the PPC get away with "High Street [or equivalent]" as a perfectly adequate description of location and a non-POFA notice excused as a "typo". Still smarting over that one!
6. Date of issue of NtK 6 June, received 11 June, end of discount period 20 June.
7. I don't really want to fight a heroic battle without much faith I have a winner in my hand nor sit tight and ignore all the threatening letters in the hope this bunch of nasty ex-clamper thugs will just give up, so paying at the discount amount seems the logical thing to do.
Life goes on.....