It has been, earlier this year; together with the later EP he also made for Collector. Entirely by coincidence; Fellside records, who now own the Collector back-catalogue, weren't aware of plans to re-publish the book. The master tapes are long lost, but Paul Adams has done a good job re-mastering from vinyl copies. It's re-issued as A. L. Lloyd: England and Her Traditional Songs. A Selection from the Penguin Book of English Folk Songs (Fellside FECD173.

http://www.fellside.com/