Hi Mike - just a little rambling from someone who knows almost nothing about W/Fs, and as usual taking information from my books - but hope of interest, and even a little help, possibly.
In the first half of the C19 James Powell produced one of their historically famous types of glass which they called 'topaz' - a rich clear amber yellow glass which contained u. oxide. In the second half of the C19 came one of their most celebrated inventions, the 'straw opal' - and again this contained uranium (from what I'm reading, 'blue opal' lacked any u. content), and production of straw opal continued for many years, though I'm unable to say whether it was still being made in the early years of the C20.
The crunch bit of my point is that - and I could be wrong - I'm going to suggest from the pieces of Powell and W/Fs that I see in books and in the flesh, that the Company didn't produce glass containing uranium oxide for the bulk of the C20, which will mean that your vase is likely not W/Fs.
Optically ribbed glass was fashionable in the first thirty to forty years of the C20, and production started at Wealdstone c. 1923, so your piece may well have some age, but possibly not W/Fs in view of the uranium content.
Obviously, comment from others who may be better informed about the factory would be essential.
