Thanks to a lot of detailed discussions on Whitefriars.com and some phone calls made by Patrick Hogan to 2 ex-W/f glassmakers, on Sunday 19th September this was pinned down as a Whitefriars piece:
So the design is not by Baxter but Alfred Fisher who joined Whitefriars as a young man in 1950 and left in 1972 . An image of one of his designs can be seen on p.368 Wendy Evans book.
Thank you Patrick and all who helped run it to ground. Great job! :hiclp: