Hello Tigerchips, thank you for taking the time to reply, you’ve given me something to search for on Google. I know very little about glass- except the sort that comes from Woolworths!
Since I posted this topic, I’ve had more of a look round this site (it’s very good isn’t it) and have searched on “resolved glass queries”. I’ve come across John Walsh Walsh who seems to have made some similar glass, ‘though I haven’t found the same shape. Does anyone know if it’s likely to be by that firm?