OP, there are 2 aspects to your question:
Substantive as regards the contravention;
Procedural.
Both may be grounds for reps.
Substantive
No idea. As per previous post you've not given any relevant facts.
Procedural
The PCN was served because the CEO had begun to prepare the PCN etc. etc - these reasons are given in full in the PCN. The times of the photos would seem to support this view. So, what happened when you returned to the car?