It was a wartime aid to keep Britain's industrial wheels spinning merrily that became a national treasure. Bandleaders and orchestral conductors of the highest calibre led the daily live ritual of wall-to-wall dance music, and, from the 1940s to the late 60s its famous theme tune, Calling All Workers by Eric Coates , was as familiar as It was called Music While You Work. Yet the BBC had not one edition of this long-running classic in its archives, until a unique private collection of hundreds of hours of tapes turned up last year. Russell Davies investigates the phenomenon that was known to fans simply as MWYW.
Producer Clare Csonka and Simon Elmes