During the war , Sargent conducted the HallÃ Orchestra in Manchester ( 1939-42 ) and the Liverpool Philharmonic ( 1942-48 ) and became a popular radio broadcaster with the BBC . During the war , Sargent directed the HallÃ Orchestra in Manchester ( 1939 â `` 42 ) and the Liverpool Philharmonic ( 1942 â `` 48 ) and became a popular BBC Home Service radio broadcaster .