Nobody that comes here for advice pays ECP. Before we continue, ask yourself why you had no prior notification of these PCNs? When you moved at some stage, did you update the V5C registration document for the car?
For now, you need to send a data rectification notice to the DPO of ECP and tell them to update their records with your current address for service and to erase your old address. The highlighted words must be used in the notice.
You can safely ignore DCBL, they are simply useless debt collectors with no powers to do anything.
For now, there is little else you can do as it is too late for any appeals. Do not offer to pay anything as that is admitting liability.
Eventually, you will receive a Letter of Claim (LoC) from DCBLs sister company DCB Legal. When you do, come back and we will advise on the next steps. Continue to ignore any and all debt collection letters.
Eventually, a claim will be issued but is easily defended and eventually, it will be discontinued.