Rock’n’Roll, the play by Tom Stoppard, is intelligent, challenging and not a musical and it is doing terrific business in the West End. Yesterday it was announced that not only has it broken box office records at the Duke of York’s Theatre, but it will also be extended for a further six weeks until November 5. David Calder will replace Brian Cox from September 26 but otherwise it will be the same cast, which includes Rufus Sewell, Sinead Cusack and Alice Eve. Directed by Trevor Nunn, producers are also discussing a possible Broadway production.