Hi Christine, thank you for the reply.
Suspect you are thinking of the Tiffin Glass Jack Frost, which appears to have a more textured finish and doesn't look like an applied finish. I think this piece is modern, and it does have an applied coating. I was surprised not to have found any other pieces apart from the eBay one, which I agree is not as described in the listing.
Since posting, I think I recall seeing a piece years ago with a marks and spencer label, and it may be that they had a range made with thicker/better quality glass and finish, by the Spanish maker of the thinner, fluted pieces.
I think I will return it with that information.