On a similar take I think it was TVs The World at War in its commentary stating that of bombs dropped by Bomber Command up to c.1942, only some 5 or less in every 100 would fall within 5 miles of the target. Regarding V1's I will always remember the the noise that sounded like a motor cycle without a silencer as a small sinister black aircraft flew over our house at about 400 ft. Within a few days of the V1 offensive many of the schoolchildren in Wallington were evacuated to districts near Birmingham.