Author Philip Pullman, actors Dafne Keen and Ruth Wilson and executive producer Jane Tranter visit the BFI IMAX to talk about adapting Pullman's YA fantasy books for TV.

The His Dark Materials series has been published in more than 40 languages and sold close to 18 million copies worldwide – its mix of magic and theology proving a hit with both children and adults.

The BBC One adaptation of the His Dark Materials trilogy starts on Sunday 4th November at 8pm.

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