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Wicked, the film adaptation of the award-winning musical, is released in the UK on 22 November. Gregory Maguire, who wrote the original book in 1995, tells the World at One's Sarah Montague what inspired him to write the origin of the Wicked Witch of the West from The Wizard of Oz, and how he is excited to see the film for the third time. Trailer credit: Wicked / Universal Pictures / Jon Chu Photo credit: Getty Images