It's NOT a fine, it NEVER will be a fine, and it has NO LEGAL grounds to be passed off as a fine, and there's nothing ILLEGAL about the parking as PPC's have no right to make traffic laws up as they go along, something which many of them seem to think that they can.
IT'S AN INVOICE, AND AN UNREASONABLE ONE AT THAT.
The most they would ever be able to reclaim in court is actual PROVABLE losses . . . i.e. the price of a P&D ticket. But they would first have to prove who the driver was, IGNORE IGNORE IGNORE, the advice given to Councillor Powell is typical of what most people do, they get frightened by the official looking document and stupidly pay it.
READ ALL ABOUT IT FIRST and you will see that its a scam.
This is a good place to start