Britain's long-running (some would say interminable) series of "Carry On" comedies managed to satirize virtually every film genre ever conceived over three decades. Since espionage dramas were hot in 1964, it was inevitable that the unwary world would be treated to Carry on Spying. The "maguffin" in this yarn is the top-secret Formula X, which has been pilfered by that insidious organization S.T.E.N.C.H. (Society for Total Extinction of Non-Existent Humans). Enter the heroes, the men and women of British Operational Security--better known as B.O.S.H. The good guys are understaffed, thus novice agent Kenneth Williams is put in charge of smashing the evil machinations of Dr. Crow (Judith Furse) and The Fat Man (Eric Pohlmann). The level of wit in Carry on Spying is sustained by the character name of leading lady Barbara Windsor, who plays the delectable Daphne Honeybutt.
~ Hal Erickson, All Movie Guide