Harry Potter: Sir Ian McKellen reveals why he turned down Dumbledore role

Sir Ian McKellen has said he could never have taken on the role of Professor Dumbledore in the Harry Potter films after the death of Richard Harris because he knew he disapproved of him as an actor.

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You can see the interview in full on Monday 7 August 2017 on BBC World News and the BBC News Channel and after on BBCiPlayer (UK only).