That's Dartington Crystal....one of my favorite "everyday" crystal companies! I have a cabinet full of the stuff just waiting for the big one (earthquake here in Alaska). The company has an interesting history of being started to provide an industry for the area after, I think, the tin mines or some other industry went kaput....a local brought in crystal folks having determined that the locals had the right "skills" for a crystal factory. If I recall it all correctly.........these days that's a maybe!