Small note, they're called "Gulvvase" (Danish for 'floorvase', plural is 'Gulvvaser'), rather than "Gull Vase".
I've seen these around - not been able to trace their origin, though. They could have been produced in Denmark and brought in to be screenprint-decorated, but equally likely is that they were produced in the UK ('Cascade Glass' is the tradename of one UK firm that had dealings in non-Danish Gulvvase production).
There's also a chance they were made in Italy, where many Gulvvase copies were produced - some closer to the original design than others.