thanks Ohio, Ivo & John for your suggestions, still not having much luck - you'd think there would be a set of these attributed somewhere!
Out of interest, I put the Geiger meter on the jug last night, wow! best reading ever, was twice that of the jobling jade candlestick, which had the previous highest score - went well into the red 'dangerous' levels of background radiation lol felt the need to move them out of the living room and into the garage just to appease the rest of the household who do not share my love of uranium glass.