Actually a 1940 cruise missile -- the Miles Hoop-la.
"In 1940, Miles Aircraft of the UK proposed an aerial torpedo they called the "Hoop-la", and constructed a mockup. The Hoop-la was a neat little high-wing aircraft built around a 450 kilogram (1,000 pound) bomb, featuring a Gipsy Major air-cooled four-cylinder inline engine, a wingspan of 4.3 meters (14 feet), and an estimated speed of over 480 KPH (300 MPH).
While the accuracy of the Hoop-la would have undoubtedly have been poor, Miles Aircraft felt that it could hit a city. Swarms of Hoop-las coming in at low altitude at night would have given German air defenses a very hard time. The British Ministry of Aircraft Production was not interested in the Hoop-la, apparently because there was still some squeamishness about general attacks on cities. If there was such squeamishness, it didn't last long, since general military bombing of cities at night became RAF Bomber Command policy in a short time, but the Hoop-la remained dead."