Tamsin Greig as Malvolia is good for equality, and for raising standards in our theatre | Susanna Rustin
It is an error to see gender-blind casting solely in terms of female advancement. It also prompts the creation of better productionsThe Royal Shakespeare Company's latest production of The Tempest stars Simon Russell Beale as Prospero, is directed by Gregory Doran and features a partly digital Ariel (Mark Quartley, sharing the role with technology giant Intel and Imaginarium Studios). This is a landmark production: o…