well i have only heard about folk camps apparantly 21st century, but the woodrcaft folk were post war, i went in the late fifties early sixties, the BBC did have a programme in the 1960s called hold down a chord which was influential.
However what i stated earlier was that radio coverage was more extensive, particularly radio na gaelchta[which is susidised and presents trad music in a non commercial way] and that this has been partly rsponsible for the relatively flourishing grassroots of the music.
of course because irish musicians were forced to emigrate in the 20th century this has strengthened the grassroots trad music particularly in cities, alot of this took place in pubs, this may or may not be a problem n the immediate futre.
northumberland in my opinion it is an english exception, there was also southern english style in then isolated o places in the 1980s east anglia and devon. I Lived there then, i did not think it was as strong in east anglia as northumberland, but you are a better judge, if you dont think more sympathetic and extensive media coverage would help., fair enough but i think you do