The "WHO" in A Matter of Who isn't a "who" but a "what". The word is an anagram for the World Health Organization, a curious subject for a British comedy--especially one which utilizes a communicable disease as a plot device! WHO operatives Terry-Thomas and Alex Nicol trace the outbreak of a smallpox epidemic to ruthless oil millionaire Guy Deghy. Offsetting the (literal) unhealthiness of the plotline is Terry-Thomas' romance with Sonja Ziemann, the widow of a smallpox victim. A Matter of WHO was picked up for U.S. distribution by MGM.