Here is a third and it is the one that I like least of all the reviews that I have read. It is interesting in that it is written from someone from outside the small pond of traditional music enthusiasts; someone from the big waters of mainstream music. Cally Callomon started off as the drummer and songwriter for 70s punk band The Bears and 80s indie band The Tea Set. He has many other associations with the music industry - Art director, sleeve designer, manager. record label boss, A&R man and so on.
It is not that it is badly written, it isn't, but there is a streak of pretentiousness running through it that irks me. The names that are dropped, in alphabetical order, are - Beethoven, Bob Dylan, Fairport Convention, Elton John, Van Gogh, Vivaldi, Rob Young - you can get a fair idea of the review from those names.
For all that, the review is not without merit. He claims to have spent three weeks reading the book and I can believe it. He does offer some outsider's analysis which if not particularly well informed, still makes valid and relevant points.

It is on the Caught By The River website at -
http://www.caughtbytheriver.net/2017/09/09/folk-song-in-england-steve-roud-cally-callomon/