If you follow the advice, you will not pay a penny to ECP. I can guarantee that this will be the sequence of events in this case... Unless you can get the landowner to make ECP cancel the PCN (unlikely but worth a try), any initial appeal and subsequent POPLA appeal are also highly unlikely to be successful.
You will then have to weather a bunch of useless debt recovery letters which you can safely ignore. Debt collectors are powerless to do anything except to try and persuade the low-hanging fruit on the gullible tree to pay up out of ignorance and fear.
Eventually, you will receive a Letter of Claim (LoC) from DCB Legal, and we will provide a suitable response. After that, you will receive an N1SDT Claim form from the CNBC and again, we will provide advice on how to respond.
In about 9-12+ months from now, the claim will either struck out or discontinued. I say this with greater than 99% certainty of the outcome.
So, for now, you try to get the landowner (or their agent) get ECP to cancel the PCN. As advised, you do everything as the Keeper. They have no idea who the driver is unless you blab it, inadvertently or otherwise. You always refer to the driver in the third party. No "I did this or that", only "the driver did this or that".