Hartley Wood was the one it reminded me of.
It looks like it was made in a fairly standard type of bottle mould, so you can probably toss in any of the 100 or so UK bottle-makers too.
It seems an odd way to get stained glass materials when there were/are plenty of UK makers that would have done it the cylinder way and these days the makers of stained glass are fairly large scale. Powell would have been one of those, as would Chance, L&M, Pilkington and about 53 others in the UK alone.
Time frame 1900-60. Financial value low, desirability high