I always tell my husband, 'That's it, I quit, I've done all I wanted,' and he's just like, 'Yeah, yeah. Sure.'

Fresh from a costume fitting, where I had been posing in front of the mirror assuming what I thought was a strong position - arms folded, butch-looking...you know - I met with the woman in charge of Holloway police station. She gave me the most invaluable advice: never let them see you cry, and never cross your arms. When I asked why, she said 'because it is a defensive action and therefore weak.

Any role that's proactive is a great role, and action roles are by their very nature proactive. You get to do stuff. I hate sitting in a corner - I'd much prefer an action role in a popcorn movie rather than pining in a corner not doing anything.

Film is a wonderful thing and it can be so many different things. I don't want to turn my back on any of the different ways movies can be. I love the movies. I love going to the films. I like very serious films, I love foreign films, and I love big, fun movies - as long as they're well made and they've got good scripts. That's the most important thing.

I do think it's well over-time to have a female Doctor Who. I think a gay, black female Doctor Who would be the best of all.

The whole 'R' rating depends on a strange sort of fantasy land where all adults are responsible people, and children only ever go to the cinema with their parents.

You can't control how other people see you or think of you. But you have to be comfortable with that.