I was able to access the images.
I would appeal to the operator strictly as vehicle keeper since their notice is not POFA complaint.
Quote (in your appeal) from the CMA open letter shown below.
https://assets.publishing.service.gov.uk/media/6a5784276d6d5c7e2845ca02/open_letter.pdfIt is clear that this operator is hoping that you haven't seen the letter which highlights such underhand behaviour from parking operators.
Paragraph 22 is the kicker - this states;
We have also seen evidence that suggests that where consumers decide, within the consideration period, to park, operators are treating the parking period as having commenced at the moment the consumer drove into the car park, rather than at the point they decided to park. In consequence, consumers may not enjoy the full period of parking that they should be entitled to.In your appeal you should draw their attention to the fact that 'time on site' is not legally regarded as the total time parked and, that in this case, it appears that the driver pulled into the car park, found a space and paid quickly. The time paid for (along with the grace period) was more than enough to cover the time the driver was parked for.
Point out that you have noted that their behaviour is demonstrably contrary to the directions given in the CMA letter since it is obvious that they are calculating the period of parking strictly using the ANPR 'time on site' and are deliberately ignoring the actual purchase time of the paid parking in order that they can issue their speculative invoice / PCN.
Follow that with wording like, "I will be more than happy to report this behaviour to the CMA if this PCN is not promptly cancelled."
In theory, they should uphold this appeal.