How long after the event did you receive the ticket? It was fortunate that you had a large enough card that you still had the video evidence.
Recently my wife was given a £100 ticket for driving through an airport drop-off lane without paying to park (she didn't actually park, the in/out time stamps were 1 min 33 seconds apart). It took them a week to issue the ticket, and 6 more days to arrive in the post, by which time her dashcam video of that day was overwritten so we had no evidence to contest the fine.
She has written to them to complain about the confusing signage. She was trying to get to the short stay car park, but possibly drove through the drop-off zone on the way.
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