The film proper begins with the Royal Air Force testing a secret light-weight metal called "Spurium" that enables nuclear aircraft to fly.

Different dialogue was substituted for the American release in which the opening parliamentary satire was reduced in length and the word "Biggles" is replaced by "Batman" when Seraph is talking of his excitement at visiting Secret Service headquarters.

[citation needed] The Monthly Film Bulletin wrote: "Vine's new adventure in this follow-up to Licensed to Kill is conceived largely in comedy terms, carried out with more zest than finesse and with rather too much of the fun failing to score.

The fault, one suspects, rests less with the players than with the script, which is too content with the obvious and makes no bones about playing to the gallery (notably in the trio of guest appearances inserted just for the hell of it, with Sidney James, Wilfrid Brambell and Joe Baker).

Michael Ripper and Tim Barrett make fetching villains, and the machine-gun blaze at the airfield will content most schoolboys; but the cursorily-treated Dawn Addams might just as well have stayed at home.