"Folk Song in England" by the aforementioned "Bert" - A.L. Lloyd deserves a look.
(A tip for BlackAcornUK - leave "What We Did Instead of Holidays" by Clinton Heylin until the very last, if at all. Very ordinary, IMHO. Not much in there you don't already know about Fairport Convention, and a very cut-and-paste feel...)
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sj