Thanks. I'm still trying to gather facts here so pl post the back of the PCN. You have, as requested, posted the front of the PCN - on which you have left your VRM which is useful - so pl don't blank out on any other posts, it's not necessary.
Some thoughts.
On the day in question, I parked as can be seen in the council's photos. At the time I parked I had just driven past a road marking LOADING ONLY and noticed the traffic sign which I looked at in detail once I'd stopped. As I was stationary outside the restricted loading hours, I left my car without any concern.
On receipt of the PCN, I couldn't understand the reason why it had been issued, there was a loading sign just to my rear and a resident's parking sign some way ahead. On viewing the council's photos, I am still none the wiser. These three photos comprise 2 close-ups and one head-on. Nowhere is there a photo of any traffic sign which suggests the CEO did not attach any weight to these signs and for all I know had another contravention in mind and simply pressed the wrong button. If the CEO did not see fit to photograph any traffic signs, or road markings for that matter, then clearly a mistake has been made because nothing in the evidence supports the alleged contravention grounds in the PCN which IMO must therefore be cancelled.
If they reject, then formal reps would give you the opportunity to attack whatever argument they use.