Total Film magazine, she said: 'I couldn't. It's so much work! It's the face of a family show and that's a lot of responsibility that I'm not comfortable with. 'But as speculation mounts that Jodie Whittaker is set to step down from the title role as Doctor Who after the next series, Billie said she would like to see the Crown star, 54, take on the role as she has 'that madcap energy'.
Asked who should be up next for the main role in the sci-fi series, she said: 'Oh I know who! Helena Bonham Carter. She's just got that madcap energy.
She's a ruddy powerhouse. ' Billie briefly reprised her role as Rose since leaving the show, in a three-episode stint in 2008 and in the 50th anniversary special 'The Day of the Doctor' in 2013.
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