Yes, I would definitely appeal. I parked for too long on a street pay space because I misread the time allowed - it said '1/2 hour' written just like that - meaning half an hour and I read it as 1 to 2 hours because I was in a rush. I was with a visually impaired relative at the time, and although they would not let me off due to my mistake, they pointed out that I should have used her disabled parking badge and said if I sent a copy of it they'd reconsider. Amazingly when I did they let me off with the fine. So they can be very reasonable. Good luck.