hello Pete - can't tell you a great deal, but some information from the Smithson's book is indicating that these Bristol Blue glasses had a design name of 'Victoria', and were first made in 1974 (the reference is FT33 - four different sizes produced).
They all appear to be goblets of varying sizes/capacities, and all had this distinctive collar underneath the bowl. Yours is either the largest, or second from largest, in my opinion.
In addition to FT33 there was an Apothecary Range of lided bowls, FT181/1 - 4 (4 pieces), of which you seem to have one example (although not sure which size) a bathroom glass, a posy vase and a ring tree - something like eleven pieces in total.
It appears that your label is the gold coloured 'D' (indicating first quality) and was used between 1970 and 1980, which does cover the time frame for all these pieces.
For how long this blue range was produced I really don't know - perhaps John or Lustrousstone will tell us.
No doubt if I say they seem to be uncommon, everyone will jump on me from a great height, but I don't get the impression they are common - bit like the Rachel Woodman Confetti range, which also now seems scarce.