This volume combines the two original British NEL publications, both with their original pagination and copyright page. Only the cover is new.
Cover artist is not credited. Re-uses the cover art of volume 1 and volume 2, both credited to Tim White.
Worldcat has a tentative 1983 as publication year, but as I (PV1) bought my copy on 19-02-1982 the February 1981 that Amazon.co.uk comes up with is more likely.