Free Traffic Legal Advice

Is there any other grounds for challenging this PCN?

I received PCN today (9-Nov). Please see below. Date of alleged contravention 31-Oct.
The ASDA Crawley car park is first hour free to park with the 2nd hour paid (or you get a free coupon from the retailer if you spend more than £35 in store). Maximum parking time is 2 hours.

The exit photo in PCN is too dark and the Registration Number of the vehicle exiting is somewhat unclear. I logged into Parkingeye's appeal page (not to submit the appeal, but to see a clearer photo). The photo evidence online is also quite dark, and the first 2 letters of Registration Number is not very clear.

PCN



Photo evidence of vehicle entering and leaving


I also have a shopping receipt of more than £142 spent at ASDA. I spent a long time shopping inside. It was Halloween night and there were long queues at the manned tills. We didn't go to self-service machines as we had a lot of items to scan. The till operator at the queue which we joined was not the fastest. There was an elderly couple at the top of the queue who spent a lot of time arguing with the till operator about something.

We stood in queue for around 15-20 minutes including the time spent scanning our items and paying. Some items didn't scan, so the operator had to manually enter the barcode number. After we purchased our items, I then stood in queue at the old Customer Service counter (now selling tobacco) waiting to be served, in order to request the free parking coupon. Upon my turn, I was told that these coupons (for 2 hours max) are now given by the security instead. I then purchased another item, which I forgot to buy the first time. I have lost this second receipt, but can show my bank statement as evidence. After that, I went to the Security to ask for the free parking coupon which they gave me after checking my receipt.

I then went to the parking payment machine outside. The window to scan the QR code was dirty with smudges. The machine was a bit temperamental and wasn't scanning the QR code. I ended up spending a couple of minutes trying to scan it. When it finally got scanned, a message on screen said I may be liable to a charge (because I had exceeded the 2 hours maximum limit) and that I may be able to appeal.

I was over the 2 hr limit by 25 min.

My questions are -
1. Are the photo evidence clear enough to be legally acceptable as evidence?
2. Is what I received considered a NtK? Or is NtK yet to arrive?
3. On Page 2, under Protection of Freedoms Act, they say "if after 29 days from date given". Should this not be 28 days? Does this make the NtK invalid?
4. Should I merely appeal based on the delays at the store which led me to spending over 2 hrs?