Reference my last comments, have received the following email reply from the Museum of London.
""Dear Mr Stirling,
Thank you for your recent enquiry, regarding our Whitefriars glass archives. We have a quantity of material in our collection which may answer your question regarding the Baxter ‘Banjo’ vases; primarily the three boxes of Baxter’s personal papers, working notes and sketches.
We also hold the Whitefriars catalogues for most years between 1967-78, and a large number of glassblowers’ workbooks covering the same period.
Regrettably, we do not have the resources to go through these archives in detail. However, you are very welcome to make an appointment at the museum to look through these archives, for the information which may answer your enquiry. If you would like to make an appointment, more information (including the booking request form) can be found here.
Best wishes,
Danielle""
I had tried, obviously without success, to assist the Museum's efforts in economizing their time searching on our behalf, by indicating that this request be restricted to data concerning Mr. Baxter's Indigo 'Banjo' design only. Apparently Indigo was one of the initial colours used in 1967 for this design. Cutbacks, cutbacks and probably yet more cutbacks - with the result that museums now lack curators, and curators lack time to research.
So, now rather a dilemma then

- having encouraged the lady to assist with our enquiry, I'm unsure that I have the stamina to wade through all of the museum's archive of which Danielle Thom speaks, consisting of the factory material, plus Mr. Geoffrey Baxter's personal notes, though I suspect there are some here who might give their molars for such an opportunity. However, assuming offers are not forthcoming, then I guess that somewhere in the coming weeks I shall have to bite the bullet.
Presumable Tom's location is too far distant to London??