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Holocaust Denier David Irving rose to prominence as a historian who refused to believe in the concentration camps of Auschwitz. In 1996 - he brought a case against Penguin Books and the American historian Deborah Lipstadt - accusing her of libelling him in her book. The case has now been made into a major film, Denial, which opens this week in the UK. Emily Maitlis spoke to its scriptwriter David Hare about parallels with now.