If you follow the advice, you won't be paying a penny to ECP. However the process is prolonged and will take around nine months to a year before the case is eventually discontinued or struck out.
Don't try and overthink this, but no initial appeal will ever be accepted. A secondary appeal to POPLA is also unlikely to be successful in this scenario, but you never know. If you can lead the assessors by the nose to the conclusion that the signs are indeed rubbish, you may have a slight chance. The Notice to Keeper (NtK) you will have received is not fully compliant with all the requirements of PoFA 2012 to be able to hold the Keeper liable but most POPLA assessors do not have the legal competence to understand that.
This will eventually lead to a load of useless debt recovery letters. Debt collector letters can be safely ignored as all they can do is try and persuade the low-hanging fruit on the gullible tree to pay up out of ignorance and fear. Eventually, a Letter of Claim (LoC) and then an N1SDT Claim Firm will arrive and once defended, with our advice, the claim will, in due course, either be struck out or discontinued.
So, do you want to fight this or not? If you do, here is the advice on what to do for the initial complaint:
There is no legal obligation on the
known keeper (the recipient of the Notice to Keeper (NtK)) to reveal the identity of the
unknown driver and no inference or assumptions can be made.
The NtK is not compliant with all the requirements of PoFA which means that if the
unknown driver is not identified, they cannot transfer liability for the charge from the
unknown driver to the
known keeper.
Use the following as your appeal. No need to embellish or remove anything from it:
I am the keeper of the vehicle and I dispute your 'parking charge'. I deny any liability or contractual agreement and I will be making a complaint about your predatory conduct to your client landowner.
As your Notice to Keeper (NtK) does not fully comply with ALL the requirements of PoFA 2012, you are unable to hold the keeper of the vehicle liable for the charge. Partial or even substantial compliance is not sufficient. There will be no admission as to who was driving and no inference or assumptions can be drawn. ECP has relied on contract law allegations of breach against the driver only.
The registered keeper cannot be presumed or inferred to have been the driver, nor pursued under some twisted interpretation of the law of agency. Your NtK can only hold the driver liable. ECP have no hope at POPLA, so you are urged to save us both a complete waste of time and cancel the PCN.