I must admit that I only recently got myself a copy of the album. It definitely fits into all the different categories that Fairport could've fit into in the 60's. Although arguably, Unhalfbricking was the first sign of Folk in the band, the elements in WWDOOH are detectable.
I don't think that's the case - WWDOOH has two traditional songs (as well as Fotheringay), whereas Unhalfbricking has only one. I reckon the former has a much folkier feel than the latter.