Looks like the Audi is a ghost (False Plates)
https://vehicleenquiry.service.gov.uk/ConfirmVehicle
Vehicle details could not be found
Vehicle details could not be found as it has not been possible to locate the vehicle details, your enquiry cannot proceed and has been cancelled. If you want to check the vehicle record held by DVLA...
A call to Wilts Police may be in order so they can put it on the ANPR database