sentences:  Francis, Richard Llewellyn, Gwyn Jones, Emlyn Williams and Philip Burton.Of these, his principal collaborators, in both production and writing, were Jack Jones and Philip Burton, who succeeded him at the BBC in 1945.Hughes’ outstanding productions are considered to be "The Proud Valley" (1940), the radio premiere of the Paul Robeson film; "How Green Was My Valley" (1942); and "Welsh Lidice" (1943).