The Night We Dropped a Clanger

Wing Commander Wing Commander Blenkinsop, VC and bar, is chosen for a top-secret mission to occupied France to investigate. His exact look-alike, Aircraftsman Atwood, is recruited to go to North Africa. However, through a farcical mixup, Blenkinkinsop finds himself in Africa and Atwood ends up in France. By far more luck than judgement, Atwood returns to England with one of the buzz bombs, and becomes a national hero.