Thanks, I feel like the main basis of my argument is going to be that the parking restriction was not clearly conveyed due to the position of the signage in relation to the car when approaching the bay, the fact the sign was too low and out of sight when I exited the drivers side, and that the restriction was not reinforced with bay markings.
IMO, no.
The signs are meaningless as regards being penalised because nowhere in the car park does it state that if a motorist does not comply with signs indicating bays reserved to BB holders then they could be penalised. A penalty is a powerful weapon reserved to the state and the state must meet certain tests before penalising people.
You refer to bay markings, but there aren't any for car parks.
You refer to regulations regarding the size and marking of disabled bays. But there aren't any.