The OP would have used his evidence as in #1 ie long queues, slow service.
POPLA will use any evidence you can supply.
Incidentally, my wife got a parking ticket at the Arnison Centre in January for overstaying.
Checked on Pepipoo, the company running the parking ( Horizon iirc ) have a useless set of t and c, and wrote to me ( owner of car ) asking for details of the driver. Replied using the Pepipoo template declining to give details and the charges were dropped.
Some parking companies back off, but not all!
The car I was using was registered in a company name when I got an invite to pay £60 for being 8 minutes late in Newcastle.
The paperwork clearly stated the driver of the vehicle had entered into a contract.
The letters got more threatening and demanded the company give the details of the driver , which unfortunately we had no record of .
It then took a very interesting turn where they decided the company was liable rather than the driver they claimed had a contract with.
Farcical at best but basically legally incorrect.
It took 8 letters from them , none of which were replied to before they gave up.
I can see why some cave in and pay up though.