As I thought, PCN issued under the Traffic Management Act 2004, that introduced the power for a council to issue a postal PCN in cases of "drive-aways", where a PCN was in course of preparation, but the driver returned and drove off before it could be served. The PCN goes to the name and address on the V5C Registration Certificate.
How long were you parked there ? I have to say, I can't see anything leaping out as an appeal argument, maybe others can.