Show us both sides of the Notice to Keeper (NtK) received. Unless their NtK is fully compliant with PoFA 2012, they can only hold the driver liable. They have no idea who the driver is unless the Keeper (the recipient of the NtK) blabs it totem, inadvertently or otherwise.
DO NOT try to appeal this until you have show us both sides of the NtK and make sure that you leave all dates and times unredacted.
Of course you should challenge this PCN because the site’s signs fail to make a dual-payment requirement clear. A reasonable driver using a clearly marked EV charging bay would assume that paying the charger fee includes permission to remain in the bay while charging. If a separate parking tariff is also required, that is a surprising term that must be clearly and prominently stated at entry, at the bay, and at the charger. It was not.
The charger sign talks about electric vehicle rapid charging and time spent charging, but says nothing about also paying a parking tariff. The main tariff board lists parking prices but says nothing about EV bays or any requirement to pay that tariff while also paying for electricity. The operator’s own site for this car park reportedly does not mention EV chargers or EV terms. Taken together, this is ambiguous and misleading.
Under the Consumer Rights Act 2015, terms must be transparent and prominent; ambiguities are interpreted against the trader. Requiring two simultaneous payments without clear, prominent warning is not transparent. Under the Private Parking Single Code of Practice (PPSCoP), key terms must be clear, conspicuous and unambiguous, and special bay rules must be identified at entry and at the bay. That did not happen here. Any ticketing while the car was actively charging also ignores the consideration and grace expectations in the Code.
Your appeal should say the vehicle was in an EV bay, actively charging, the driver paid for electricity, and that no sign made a separate parking tariff clear in addition to the charging fee. State that any such term is ambiguous and unfair and therefore unenforceable.
Keep evidence. Photos of the charger sign and the main tariff board showing no EV dual-payment warning. Proof the car was plugged in and charging. Charger receipt or app screenshot. Screenshot of the operator’s webpage for that site showing no EV information.
Ask NPC to produce a contemporaneous site map of all signs on the material date, close-ups of any EV-specific terms at entry, bay and charger, and proof that the RingGo or charger journey disclosed a requirement to pay both fees at this location.
If they refuse, you can escalate on the same basis: unclear and misleading signage, unfair term requiring dual payment, and non-compliance with the Single Code.
Until we can establish whether their NtK was fully compliant with PoFA, you, the Keeper, must only ever refer to the driver in the third person. No "I did this or that", only "the driver did this or that".