Fifty years since Oh What a Lovely War was first performed, Night Waves pays tribute to Joan Littlewood's revolutionary anti-war musical. In a programme recorded before an audience at the Theatre Royal Stratford East where the show received its premiere, Samira Ahmed and her guests, the critic, Michael Billington, Erica Whyman from the RSC, the historian, David Kynaston and Murray Melvin from the original cast, discuss how Oh What A Lovely War changed Britain's theatrical landscape and redefined the way the think about the First World War.