I look at it this way.
The most difficult hand made fancy glass to attribute is a simple container. Flutes, footed pieces, and stems all help make it easier.
Here (http://glassgallery.yobunny.org.uk/displayimage.php?pos=-8614) is a 1939 advertisement for a classic epergne with a mirror plateau base by Haden, Mullett & Haden. In the Fratelli Toso factory collection there are examples of classic epergnes which were still being made and supplied to the British antiques trade in the late '50s and possibly into the '60s.
I noted three features of the glass of this epergne which might help attribution:
Shaded colour was a premium option for a considerable time by S&W for many of their patterns.Peacock Eye and dab trails were certainly made by Stuart and by Richardson.The eclectic rim crimp is unusual and should be carefully checked for a match in reliable publications and websites.Finally don't forget that Eric Reynolds discovered references to Walsh Sateen glass in a metalbasher's factory pattern book in the Sheffield archives. They might be worth contacting.
Bernard C. 8)