Hilary Mantel interview: 'There isn't a quota system for winning book prizes' 

Hilary Mantel interview: 'There isn't a quota system for winning book prizes'
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As Hilary Mantel adds the Costa Book award to her collection of accolades for Bring Up the Bodies, her second novel about Henry VIII's adviser Thomas Cromwell, she tells Sarah Crown about her reaction to winning prizes; her working process; and the challenges of writing a historical novel.