Minute from [General Sir Hastings] Ismay [Chief of Staff to the Minister of Defence] to WSC giving background on the decision not to sound the sirens for single flying bomb incidents, sending on information on the "spread" of flying bombs [around London] in June and July 1944 [CHAR 20/231/52], and recommending that WSC does not make use of these statistics because of a ban on publishing such details. [signed].