BEM's editor and publisher, Martin Lock, notes in his editorial that McMahon was forced to draw the cover artwork twice due to the first version disappearing in the post, a common occurrence in those pre-internet days.
The issue itself contained an interview with acting Mighty One Steve McManus and script droid Alan Grant. McMahon provided original artwork that, with the exception of Dredd, are to my knowledge the only examples of him drawing characters such as Dan Dare, Mach Zero and Blackhawk.