If you’re relying on PoFA wording failures, state what the Notice to Keeper says (or fails to say) and why that does not meet the mandatory requirements.
Also add two core POPLA points that you’ve currently missed:
A) No evidence of landowner authority (standing)
UKPC are put to strict proof that they have the necessary authorisation to operate and to issue PCNs at Harbour Exchange Square, and to pursue payment and/or appeals in their own name.
A generic “site agreement”, witness statement, or a contract with a managing agent is not sufficient unless it is shown to be contemporaneous and to flow from the landowner and to confer the necessary rights. The operator must produce an unredacted (save for financials) contemporaneous contract or chain of authority in force on the material date which expressly grants them:
1. authority to manage parking at this location,
2. authority to issue PCNs,
3. authority to pursue payment and enforce in their own name (including litigation, if relied upon).
If UKPC cannot produce this, they have no standing and the charge must fail.
B) Inadequate proof of signage and terms (strict proof required)
UKPC must prove, with contemporaneous photographs from the material date (or at least from the same period) that clear, readable signs were in place and visible to a driver upon entry and throughout the area where the vehicle was parked.
This is a barrier-controlled site where access is managed by security. The operator is therefore put to strict proof of:
1. the exact signs relied upon, their locations, and whether they were visible before parking,
2. that the key terms (including any maximum stay and the £100 charge) were prominent, legible, and capable of being read without leaving the vehicle and searching for signage,
3. that any signs were not obscured, unlit, high-mounted, or positioned such that a driver would not reasonably see and read them.
Stock photos, close-up photos of a sign without context, or photos taken months/years later are not adequate proof of the signage in place at the material time.
Put “No keeper liability (PoFA)” first. Then add “No standing/landowner authority” and “Signage/terms not proven” immediately after. Keep the Equality Act/security-permission point, but drop any “another Blue Badge didn’t get a PCN” point entirely.
Don't worry too much about POPLA. If it isn't successful, then it doesn't matter as their decision is not binding on you. It would then go to a county court claim which I can guarantee with greater then 99.9% certainty it would either be struck out or discontinued.