Southampton Leisureworld PCN

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Vehicle parked in the car park at Leisureworld on 31 Oct arriving at 17:42. Parking is free after 18:00. Parking is also free if visiting the Odeon cinema or other establishments but you have to get a ticket from a machine in the cinema. This was not realised and it was very dark in the car park, so notices were also not seen. Registered keeper received a PCN from Parking Eye (PE). Credit card statement showing purchase of tickets and Odeon cinema tickets were submitted in an appeal to PE. Appeal was rejected and a POPLA reference provided. Is it enough grounds to just state the above and provide the evidence to POPLA or is a full legal jargon appeal required using previous cases as an example/boilerplate?