The images are all irrelevant.
If the driver breached a term of a contract for parking, and if the charge for breach is commercially justified, then the driver owes a debt to the parking company.
If the parking company complied with the requirements of Schedule 4 to the Protection of Freedoms Act 2012, then they can hold the RK liable if they do not know the name and address of the driver.
The initial paperwork is relevant.
The signs in the car park are relevant.
What the driver did is relevant.
Any appeals lodged are relevant.
A letter before action/letter of claim is relevant.
A county court claim form is extremely relevant.
Anything else is just noise. Either you are going to pay the PPC or you aren't. Either they can prove who was driving, or hold the RK liable, or they can't. They will either take you to court or they won't. A judge would either find in their favour or he wouldn't.
Whether you got a letter from a debt collector, or your sister-in-law's hairdresser's cat-sitter is utterly irrelevant beyond indicating that they would still very much like you to give them lots of money. That is always the case.