The actor and theatre-maker had such a good time playing Malvolio in Shakespeare's comedy that he wrote a whole show for himIn the mid-90s, I acted in a production of Tom Stoppard's Rosencrantz and Guildenstern Are Dead, which tells the story of Hamlet from the point of view of Hamlet's university friends. It's the "minor" characters in Shakespeare, rather than the headliners, who have always fascinated me. They are …