Not sure how you prove you left and returned if their cameras didn't pick it up. Anyone could park all day with purchases at either end then claim they'd left and returned. Can you prove the car was somewhere else during the day? Anyway POPLA say "We have received many appeals where appellants have questioned the accuracy and the reliability of ANPR cameras. We consider the evidence in each case on its own merits. In circumstances where a parking operator’s evidence is the vehicle entering and exiting but an appellant provides persuasive evidence that they were not there for the full period, or did not enter, we have allowed appeals."
The test case is Beavis (overstaying in a retail park). The courts say that the business model is based on fines for overstaying and is justified by the need to ensure spaces are available for other customers.
Best I can find for the OP is that if they don't withdraw the ticket or POPLA don't allow the appeal, you'd have to ignore all the debt collection letters and wait till you get a notice of court proceedings then you'll be talking to a lawyer who will prefer to take a safer case to court.
http://parking-prankster.blogspot.co.uk/2014/03/new-transcript-available-parkingeye-v.html?m=1
The test case is Beavis (overstaying in a retail park). The courts say that the business model is based on fines for overstaying and is justified by the need to ensure spaces are available for other customers.
Best I can find for the OP is that if they don't withdraw the ticket or POPLA don't allow the appeal, you'd have to ignore all the debt collection letters and wait till you get a notice of court proceedings then you'll be talking to a lawyer who will prefer to take a safer case to court.
http://parking-prankster.blogspot.co.uk/2014/03/new-transcript-available-parkingeye-v.html?m=1