The best way to find out is to approach your "local history society group", your local conservation officer ( CO) should be able to help even if it would be just to put you in touch with right people.
Local traditions regarding external decour changed like our new contemporary mass produced kitchens, people use what is the new trend in the shops. They had lots of choises regarding colour pigmentation but used in the same method of application, If the "joneses" had a brighter wall it would set a trend and everybody would "follow suit". ( untill a brighter spark would come up with a better pigmentation and the trend changed again)
I've recommended this book before: John Prizeman 'Houses of Britain: the Outside View' published by Quiller Press. It really is fantastic at illustrating the history of different external finishes and regional differences. I found it helpful in deciding on the external colour scheme for my house in north Oxfordshire.
Regarding traditional house colours,- you will find that most local councils are not interested in this sadley. More of getting their own way. I have applied to change colours of front renders in many different areas in the last 20 years. Everyone of them has a differfent "interpretation" of their own ambiguous paperwork. It does RELY on the local listed buildings officer, and like the weather they are not to be relied upon, as they are only giving a personal opinion. If this is not so why does it vary from county to county. Yes I know of all the jargon about local stone, so far I have yet to see this point mean anything if they don't want it to. English Heritage has stated that there are no "rules". Personally I would rather go with them than any local council officer.