Thanks Tony,
Sorry to disappoint you, vase isn't for sale yet, but of course I will let you know if I decide to part with it in future.
I have had a look at Chris & Val's excellent site, from what I can make out, the design is slightly different. My vase has vertical grooves where the panels meet on the body of the vase, these seem absent on the vases shown. Likewise the band of decoration on the Davidson example appears to consist of just diagonal elements making a band of repeating 'X' shapes, whereas my vase has vertical lines between the 'x's.
It seems to be another case of two glassworks producing very similar patterns: I wonder which came first?
Steven