I'd sort of concluded from your previous inputs that my efforts needed a more "holistic" approach. My reliance on brewery records (mainly dug up by Ron and Edd) was only going to keep me going so long, and by the latter part of the "Georgian era" that tactic was failing fast. Didn't pay enough attention to history at school, but I had heard of the "Industrial Revolution" and looking that up was given the dates 1760 to 1820/40. Now there's a "coincidence"? And bumping into the backend of that, the philosophies of the "Age of Enlightenment".
Crikey, no wonder my ears were deaf to this stuff first time around. But this time I've added the magic ingredient ... beer!
It's a big step from the relative certainties of "brewery records" to snippets of stories from the past that must be processed by some possibly dodgy PeeBee conjecture. Still, I can always skip that and go straight for the views of some American "craft beer" historian; like possibly those advising the BJCP?