When you write for very young children what they want is something familiar and safe and stereotyped.

Sometimes I go, “What am I doing with my life?” But then I get letters from young women, or people come up to me, and they say, “You’ve made such a difference to my confidence.” And that is a good thing. I should read more fan mail though. I’m crap at responding.

I do think imperfection's underrated.

I’m more comfortable with myself than when I was younger. I hated myself then. Wait, I didn’t hate myself – that’s a strong word. But I was so diffident. I didn’t know how to act, for one. I had no confidence in that area or in myself at all, really. I had a big inner critic and still do. I just don’t listen to it so much.

I also get fed up with the fact that casting agents and directors have this impression of me as being frail and petite. I find it very patronizing. I'm quite beefy and strong. I was a gymnast in school and I have lots of muscles.

You just have to do what suits you, and it doesn't matter if you don't look like everybody else. Be you. That's our gift and we've got to celebrate that.

I loved doing all those costume dramas. I didn't think, 'Ooh I've got to avoid being typecast' - you can't ever be dictated to by what other people think. I just do things because I fancy the parts and the directors.