The relevant bit in Article 8 says
"(c) that every part of the vehicle is within the limits of a parking bay, which is the
appropriate bay in relation to the ticket parking machine, in which has been
or should have been inserted any coin or coins for the purpose of payment of
the parking charge"
This is same wording as we've recently seen in another similar case from another authority.
To me it fails simply because there is no payment machine that the bay relates to. It is wording that harks back to parking meters for each bay, without parking meters, the clause makes little sense.
We also have the arguments on clarity of markings and that the requirement to park in marked bays is not conveyed on appropriate signage (though may be on any payment machine?)