You can’t play the part of Hamlet, only parts of Hamlet. And the bits Benedict Cumberbatch offers us are of the highest calibre. He delivers the soliloquies with a meticulous and absorbing clarity like a lawyer in the robing room mastering a brief before his summing-up. And though he’s a decade too old to play the prince (the grave scene sets his age at about 28), he cavorts about the stage like a ballet dancer delighting in his own athleticism.