Sorry, I forgot to update. I received the NTO on the 16th. The council sent it on the last day possible with 1st class next day delivery...
The album with the NTO is here:
https://imgur.com/a/mFW7X5uAs the above user helpfully added, I don't lose anything by taking this all the way as the fine will remain the same.
In the representations, my point would be that:
1. The lines are completely faded. The start of the double yellow is completely gone. The part where I was parked was almost completely gone too. The CEO's camera's high contrast/saturation is hiding this fact.
2. There are no nearby signs (given that this is a controlled parking zone), and no way to see that there are restrictions given that the lines were faded.
3. I have a resident permit for the entire area where I was parked, which added to the confusion.
I would also add that this process of missing the first NTO, which should definitely be sent by recorded delivery if a missed delivery results in a debt being registered, plus not re-offering a discount through no fault of my own means I am unreasonably being punished here.