Thanks all, it's a process of elimination this!
Nic I can see why you thought that, thanks for flagging them up.

Max, thanks. I did look at the Krosno ones a while ago and they do have an opening to the bubble. Mine are completely encased. Flat bottomed. The closest match I've seen so far is the ones from Debenhams... I can't find the goblets but they have
sundaes which are very very similar (and tumblers and hi-balls to match)... these are the ones made in Belgium.