To my knowledge (which is open to change in the light of any evidence emerging) the ranges produced by Dartington studio were very well-defined rather than anything "experimental going along those lines", m -
(And I know you would not confuse or conflate this Cloissonne-like piece for a bit of Alchemy - I can see your reasoning!).
I was paying a lot of attention to the Studio stuff at the time - what I gathered from the staff was that they were producing each range (possibly just one range at a time) for a fairly short period of time. I had 2 Alchemy pieces, then I saw one of the gold foiled Italianate pieces but when I wanted to buy one I had to get it specially made for me, Alchemy was no longer available by them (I'd have liked more) and I was told the next things they would be doing would be the swirled and frilly ruby (using real gold) stuff...... I have no interest in frilly, but kept an eye open for anything that might follw that. Nothing did.
The cased Cloissonne-type plates and vases were issued around the same time, I think, as the Alchemy.
I found both of these designs in the same (luxury new goods) shop at the same time.