Producer Cameron Mackintosh is trying to hit another home run with a production of “Mary Poppins”. It contains songs from the old Disney movie plus some new music. “The oft-predicted demise of the blockbuster musical is still a long way off, the impresario, unsurprisingly, believes. ‘The only thing that really changes is the writers. The profession can often be wrong about what the audience wants, but then someone will come up with something different’.”