@Allogenes said
"Or is it more likely that the Cipher Manuscript Formulae was passed on from Kenneth Mackenzie, colleague of Rev. A. F. A. Woodford, another original Chief of the GD, as has also been claimed?"
I think the case for Mackenzie is a strong one, though I don't know if it's fair to call him a "Chief of the GD." He may have received the information in the cipher manuscript from an earlier source, but he may have also created it all himself.
R. A. Gilbert and others proposed (and gradually strengthed) the Mackenzie case throughout the 1990s and early 2000s. Some of the key articles include:
Gilbert, R. A., 1990, "Provenance Unknown: A Tentative Solution to the Riddle of the Cipher Manuscript of the Golden Dawn," in Wege und Abwege: Beitraege zur europaeischen Geistesgeschichte der Neuzeit, ed. A. Goetz von Olenhusen (Freiburg: Hochschul Verlag), p. 79. (This article was reprinted in Darcy Kuntz's 1996 The Complete Golden Dawn Cipher Manuscript book.)
Heisler, R. 1989, "Precursors of the Golden Dawn," in Cauda Pavonis: Studies in Hermeticism, vol. 8, no. 1, 1-4.
Prinke, R. T. 1987, "The Deeper Roots of the Golden Dawn," in The Hermetic Journal, 36, 16.
Some of these articles may now be online, but I haven't looked...
Steve