My apologies for my tone and rant Jim. I could simply have posted: Try googling "dartington glass hexagon".
Yes, FT84, known by the factory workers as "The hexagons are coming", produced in the usual four Dartington colours clear, midnight, kingfisher and flame. Design date of 1968 or 69. Information from: Dartington Glass, The First Twenty Years by Linda and Stuart Smithson.
John (Rosie has got me sussed)...