I've just explored your pictures, Pete, and found that the unknown lamp base I found today in Carlisle is the same as your Caithness early lamp base by Domhnall Obroin here: Lamp Base except mine is the Peat colour not green.
Hi Anne,
A very nice find! I'm glad to have helped in a roundabout way with the i-d.
According to Miller's 2004 this design featured in 'Modern Glass' by Geoffrey Beard in 1968 and was described as being 'the most modern glass design'. I wouldn't have argued with that statement today, never mind nearly 40 years ago,..pure class!

Not that I was here 40 years ago!
Thanks for the i-d on the Ravenhead glasses, at last I've updated the details. I actually quite like these and use them myself, usually the tumblers for my pomegranite juice, though I find a lot of people don't seem to like drinking from blue glass for some reason.
Thanks again,
Pete