As I said further up, PPS will definitely reject, and there's a fair chance POPLA will too (although the relevant land point might interest them). With that in mind, my personal view would be that you should submit a robust appeal to PPS. Although they will reject, it will show them that you are not a pushover, and that you know your stuff. As a starter for 10, here's what I've drafted up:
Dear sirs,
I have received your notice to keeper (Reference # ________) for vehicle registration mark ____ ___, in which you alleged that the driver of the vehicle is liable to pay a parking charge. I am appealing as the registered keeper. There is no obligation for me to name the driver and I will not be doing so. I am appealing this charge on the following grounds:
1. No keeper liability - failure to comply with Schedule 4 of the Protection of Freedoms Act (PoFA)
I note from your correspondence that you claim that you will be able to recover the charge from me, the keeper, using the provisions of Schedule 4 of PoFA. However, you have failed to comply with the strict requirements of the Act. Your notice alleges that the vehicle was parked at "Holloway Street, Hounslow". However, as can be verified from your own photos, the vehicle was not stopped at Holloway Street at any point. The photos show the vehicle in question was actually stopped on Matisse Road, a different road entirely.
As your notice does not correctly specify where the vehicle was, you have failed to specify the relevant land, as required by paragraph 9(2)(a) of PoFA. As a result of this failure, you are unable to recover any unpaid charge from me, the registered keeper.
2. The driver was not afforded a sufficient consideration period
It is well-established in contract law that a party cannot be bound by contract terms with which he has had no real opportunity of becoming acquainted. This is reinforced by 5.1. of the Private Parking Sector Single Code of Practice, which deals with appropriate consideration periods. The pictures taken by the PPS operative of the vehicle cover a period of ~1 minute, a time that is clearly insufficient to properly read the terms of the alleged contract.
3. The signage is incapable of forming a valid contract between PPS and the driver
The signage at the site stats "NO PARKING AT ANY TIME", and "strictly no parking, waiting or loading at any time". These instructions are clearly forbidding, and make no offer to the driver to park on certain terms. On the contrary, they forbid any parking or waiting. If there is no offer to park on certain terms, there can be no contract, meaning no charge can be due.
Each of the reasons above is sufficient grounds to cancel the PCN. I therefore request that you uphold this appeal. If you chose not to do so, you must issue a POPLA code.
Yours,