PlanA is to get the landowner to cancel the PCN. You can usually find the landowners managing agent info on the big advertising plinth somewhere near the entrance to the retail park, or you can try and use auntie Google.
You should also send a written complaint, preferably by email, to each of the retailers where you spent money and tell them about your disgust and anger at being invoiced for £100 by an unregulated ex-clamper parking company simply for being a patron of their stores and that they should pass on to their landlord that this is likely to affect their future sales and that you are in mind to return all the items purchased in protest as this extortion.
So, when you've done that and made your complaint to the landlords managing agent,, if that doesn't get the PCN cancelled, you can then appeal to GroupNexus (CP Plus Ltd). Their Notice to Keeper (NtK) is not fully compliant with PoFA and so they cannot hold the Keeper liable, only the unknown (to them) driver. You will be appealing only as the Keeper and any reference to the the driver will be in the third person.
Edited to add: It took me about 20 seconds to gather this relevant information about the managing agent:
Ashford Retail Park, located in Ashford, Kent (TN24 0SG), is owned by Nuveen Real Estate. The managing agent for the property is Park Place Retail. For inquiries, you can contact David Marsden at 07786 513 597 or via email at david.marsden@parkplaceretail.co.uk.
Remember, a phone conversation is not worth the paper it isn't written on.
