in fact Paul did mean the vertical ones
- he's not anywhere near as clever as Ivo or Christine
You're probably part way correct in suggesting there's a lack of Arts & Crafts glass .................. as a style it's more frequently encountered in the form of furniture, silver, and perhaps some hand made copper work, and it's overshadowed in the U.K. by the far greater volume and better understood styles of art nouveau and Glasgow School.
Small handcraft guilds seem to have been all the rage in the closing years of the C19.
Do have a look at Dresser's 'Clutha' designs - he may have already been speaking to Ruskin, and between them they tried to formulate a set of rules which would create simple yet functional lines - apparently the Clutha pieces were in some part based on historic shapes. These guys obviously had it in for the ornate and flowery Victorian decoration - Ruskin hated cut glass it seems and Dresser probably thought we should all go back to Roman simplicity.
Also have a look at Philip Webb's designs for glass made by Powell's - again very simple lines lacking the flowery ornament of other contemporary Victorian fashion, and probably a very early attempt at departing from art nouveau. He was a big mate of Morris and they had some business connections I think.
You can see some of these pieces in the V. & A. in London - but of course you may not be in the area - so try their on line catalogues.
Bottom line is almost certainly that you will never find any original A. & C. glass yourself - probably as rare as hen's teeth.