Derek Schofield did say on the thread Penguin (UK) reissue 'English Folk Songs that The Classic Book of English Folk Songs is due to be reprinted by the EFDSS. At the the time he still had a few copies available for sale. This is the edition worth getting, and worth waiting for as it contains some really valuable information about the songs and their singers researched by Malcolm Douglas.
The new Penguin issue in their 'English Journeys' series is simply a reprint of the original 1959 edition - it is a nice copy to own but the print is very small (to my elderly eyes!) and while the songs in it are just as good as they were 50 years ago the notes are seriously out of date.
If you are looking for other good song books the newly redesigned website at EDFSS has a wonderful choice on offer. 'Still Growing', 'Dear Companion', 'Traveller's Joy' (with CD), and 'Marrrow Bones' (revised by Malcolm Douglas and Steve Gardham) are all good buys.

Matthew Edwards