Zaragoza was of course the Opel factory in Spain, which is why I asked if it was Opel badged.
As far as I remember Vauxhalls were not sold in Spain, and if I recall correctly a manufacturer could only sell a very limited number of cars in Spain at the time of the Ventora (only about 100 or less I think) unless they actually had an assembly plant in Spain.
So, was it badged as a Vauxhall?