Minute from [WSC] to "C" [General Sir Stewart Menzies, Head of the Secret Intelligence Service, MI6] on reducing the circulation of "Boniface" [codename for Enigma decrypts] in Britain, the Middle East and "Torch" [codename for the Allied invasion of North West Africa] Headquarters, to a new restricted circle, and also to the present circle, which would be gradually phased out. [WSC] also asks that Field Marshal Jan Smuts [Prime Minister of South Africa] should be kept fully informed with a series of telegrams direct from [WSC], codenamed "Winch". Carbon copy. Additional copy at CHAR 20/91B/21 - 22.