hi everyone, well emailed them and got a reply by return as follows:-
Edouard Henry Dreyfous was an antique dealer in London. His original premises, opened in the 1890s, was 104E Mount Street. In 1899 he moved to Grosvenor Square and in 1913 to 30 Old Bond Street. Queen Alexandra (the consort of Edward VII) was one of his best customers and her purchases included a range of articles including enamel, glass and pieces in the style of Faberge. Queen Mary (the consort of George V) also patronised the shop. There are a number of pieces from his shop in the Royal Collection, some of which bear his stamp. I attach the details of one his pieces from our website, which was featured in the recent exhibition of Faberge held at the Queen's Gallery. http://www.royalcollection.org.uk/egallery/object.asp?maker=DREYFOUSE&object=8941&row=0
I am sure the vase is of about the same date, the 1890s/1900s, judging by the style of decoration, and undoubtedly was from his shop, atlhough originally produced in Paris.
I hope this information is of some help to you"