' Britain's Bomber Offensive ' : radio picture showing the growth of the bomber offensive against Germany and its effect on German economic and military life. Written by Allan A. Michie and Robert Barr. Directed by John Glyn-Jones . Music played by the London Symphony Orchestra, conducted by Muir Mathieson. Recording of the seventh of a new BBC feature series under the direction of Laurence Gilliam , broadcast weekly in the BBC North American Service and re-broadcast in the United States by the Blue Network