Just to update everyone on this. Whilst we are still waiting for the fines to reach us. We understand that the fines will be in the region of eight hundred euro. Five hundred of this is a fine from the DVLA . (As the car was Sorn) The Spanish Police both Local & Guardia have access to the records held by the DVLA. So please do not wait to be stopped, matriculate your car as soon as you can.
In our case-the car was just our old runabout , but had it have been our Morris then we would have been mortified.