Just got this reply from Doulton ref my vase:-
"Unfortunately, we have no old reference books here on Royal Doulton Crystal and its ranges,
Royal Doulton was taken over by Wedgwood approx 6 years ago, and in the re-location from the Doulton premises most of the old reference books were mistakenly thrown away or misplaced, When Wedgwood went into Administration 2009 the Royal Doulton Archivist lost his position within the Company, therefore, I am unable to consult anyone, or a reference book regarding your item"
Can't find any threads on this board either, does anyone have any ideas on Doulton studio/art glass?
Nick