@Bkkee have a look at John Carmody v London Borough of Redbridge (2210237357, 24 June 2021) (http://John Carmody v London Borough of Redbridge (2210237357, 24 June 2021))
This PCN was issued for the alleged contravention of being parked in Gaysham Avenue at 11.32am on 5 March 2021 without payment of the parking charge.
The CEO's images show that Mr Carmody's vehicle was parked with a pay and display ticket displayed in the windscreen. The ticket was valid from 11.27am to 12.27pm. The vehicle registration had not been completed. It is not in dispute that there was an hour's free parking at this location with the display of a pay and display ticket.
I allow the appeal because the PCN was issued for the wrong contravention. A vehicle cannot be parked without payment of the parking charge when no charge is payable. The PCN should have been issued for the alleged contravention of being parked without displaying a valid pay and display ticket.
Just wait for the notice to owner and then make the same representation again. If they're stupid enough to reject, we'll help you sort out the tribunal appeal.