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Kirsty Young's castaway is the actor David Tennant.

He has been voted the best Dr Who ever and has redefined the Time Lord for a generation of parents and children.

As a child he was a huge fan of the programme; he reckons he only ever missed one episode, wore a long stripy scarf and queued up to meet Tom Baker and get his autograph. As a role, he says, it appealed not just to his adult self but to the eight-year-old boy who was just below the surface.