Hi Jayne - thanks very much, although I have to admit to some embarrassment, as I've just looked through the 'Bagley Glass' book, and now seen the short paragraph that provides the answer to my original question. The book states that "about 1946 the government confiscated Bagley's stocks of uranium-enriched glass ingredients (several tons). Bagley's glass made after this date does not contain uranium, so does not fluoresce under u.v. light etc. etc." Just goes to show that we should read out books properly - and if you have the book, it's on page 20.
Obviously, governments at that date were just realizing the value and potential of uranium, so I guess wanted to make sure it all belonged to them - although I had always assumed that the u. of which we speak was the 'spent' sort, and did not qualify for weapons grade??
However, enjoyed reading the article, and my thanks for doing the research for me. My vase has a satinized finish both inside and out, so assume the process was acide rather than sand blasting. Do I assume you do not have a copy of the book in question??