"I't, it really is you that don't understand,'Folk' is just a word coined to describe a particular type and style of music in the same way as jazz, pop, rock etc etc! "
And what you don't understand is it isn't any such thing
It is a word coined to describe the origins of a song, story, custom tune, dance belief.... and a whole number of other related disciplines that have undergone a certain process - style, type or form have nothing whatever to do with the term - totally with Lighter on this one.
By the way -I'm not sure where you think the acoustic guitar fits into all of this, by and large, the British and Irish traditions were unaccompanied - the guitar was a very handy revival tool introduced into the revival by modern folkies to perform folk songs - tried hard myself but could never get the hang of it so I got my mate to do it for me when AND IF I needed it.
Spain maybe, not Norfolk.
Jim Carroll