A new work by Jeanie O'Hare distils four Shakespeare plays to retell the story of the Wars of the Roses, focusing on Margaret of Anjou, the formidable wife of Henry VIThe unmissable theatre of 2018On posters outside the Royal Exchange theatre in Manchester, Jade Anouka's face looks out over passing traffic. "Queen Margaret," the text below her reads. "Taken from William Shakespeare."Taken how, exactly? Is this some k…