This may be prejudging a book I have not yet read - we'll see.
Do you think it possible that your prejudiced comments might carry more weight if you had waited until after you had read it before making them?
Would you consider that people reading this might be of the opinion that you come to come to the subject of English Folk Song with pre-formed, blinkered views rather than approaching it with an open mind?
Those of us who have had the opportunity of working extensively with Steve Roud are in awe of his extensive knowledge of the English tradition which he seems to have at his finger tips. He is also open minded and fair in his discussions and willing to give credence to the experience and opinions of others. He avoids speculation and bases his claiams only when he has well-researched backing for his statements.

I can think of no better qualified person to write a book on this subject. However, I will not venture an opinion on something that I have not read.