Hi There,
According to author (and Oral Historian of the IWM) Peter Hart, in his superb book
Bloody April; Slaughter in the Skies Over Arras, pages 298-299, this poem was written by one of Mannock's squadron mates in 40 Sqdn: "One rather clever parody of Edward Lear's
Jabberwocky written by Captain William Bond, was popular in the 40 Squadron mess. It was prompted by the success of a BE2e in shooting down an Albatros....(Hart then quotes the poem in full)...Lieutenant
Edward Mannock obviously must have appreciated this 'nonsense; because a copy of Bond's parody remains attached to his diary deep in the bowels of the RAF Museum to this very day."
So, I'm not sure who's right. However, I love the poem....