Lovely vase Christine - especially in uranium. According to Simon Cottle's 'Sowerby' booklet, this 'holder' (they didn't seem to like the word frog) was the flower support which accompanied both Christine's 'LILY' vase and the factory's 'IRIS' vase. Very similar designs except that on the IRIS design the fingers pointed downward - both designs look to have been 'new' in 1933 - pattern book No. 30.
Apparently there were four new 'Table Centres' promoted at the same time, and all look to have been available in flint, amber, green rosalin and powder blue, and all were sold with black plinths - no plinth for this one Christine?

I used to see these things on odd occasions on my walks, but they now appear to be extinct - probably all on ebay.