Stu it would surprise me if they were uranium, though. Earlier production (pre-war) from these factories in green maybe. What you are almost certainly seeing is a dull green glow best seen in the dark. That is caused by manganese, which was used as a decolorising agent until it became too expensive, yes even in coloured glass.
Uranium gives a knock your socks off bright green in daylight, although it's sometimes hard to see in bright sunlight. Your Bagley Wheatsheaf might have been a better bet. Although all green Bagley does not contain uranium, only older stuff and some ranges are found in both.