But who could it be? Getty Images The bookmakers' favourites include Ben Whishaw - Q in the James Bond films - who has the required combination of geekiness and eccentricity. However, the last time the vacancy arose, he said: "I dont think you can be Q and Doctor Who. It would be a bit wrong." Getty Images Another popular choice would be The IT Crowd's Richard Ayoade - although he may be tied up presenting The Crystal Maze comeback on Channel 4. Getty Images Is it time for the first female Doctor? Billie Piper has said it would "feel like a snub" if the role went to another man. Olivia Colman

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