thanks Tim - you're right, it isn't of any help

- yes, I do have Jeanette and Nigel's little booklet, and I looked through the W.C. section six times - and like you I'm fairly certain this design isn't there, although have to say that some of the pix could have done with better contrast and larger format - some are very indistinct and small that it's nigh on impossible to see detail.
I also have all of the Studio 'Year Books of Decorative Art' from 1920 to 1956 - and it doesn't appear there either, though suppose I might have missed it.
This just struck me as an odd shape, compared to standard type vases where mostly the cross-section is circular in varying sizes.
Does Nigel still look in? - I hadn't been aware of seeing his words for a long time, but then I was absent for a while too. Once we were quite good friends - he came to my house for some chats on glass (and coffee), but we've lost touch, probably because he thought I wasn't keen enough
We are so desperate for a really good book on cut glass - will it ever come I wonder.