Nice one, Roy!
There is a similar item pictured on page 91 of John Simmonds' book, Paperweights from Great Britain 1930-2000, under the section for Strathearn. However, I have tested that item under both longwave and shortwave UV and the results suggest it was not made in the Strathearn years.
The book only shows a profile view. A view showing the canes in the dome is not so good as all are "smudged" (see below). But I have examined the canes from below, (they are set high in the dome), and they are early Ysart of the type seen typically in pre-1956 Vasart pieces. Your item, Roy, also has canes that all tie in with the pre-1956 work.
My conclusion, so far, is that these "mantle ornaments" were made by Salvador Ysart sometime in the mid-1940s to mid-1950s. But I am also keeping an open mind about them being 1930s.
Here is an oblique view of the one in the book (it's in my keeping now):