I used to want to be in 'Downton' because I had never been in a period drama, but then I did 'The Suspicions of Mr Whicher' and had to wear one of those frocks and... I didn't feel very comfortable.

I was never one of those surly teenagers who doesn't smile. My lovely godfather said it was always lovely to see me because I was the only teenager who smiled. And I was so in awe of him, I thought it was one of the best things anyone had ever said to me. So it made me want to live up to what he said.

I've always done drama, but I suppose 'Tyrannosaur' was a bit of a watershed moment for me. It was like when Kathy Burke did 'Nil By Mouth' - suddenly, people were saying, 'Oh, she can do that, too.'

You see thousands of films you forget the minute you come out of the cinema, don't you? Because they don't mean anything. It's the tough ones like 'Breaking the Waves' and 'Nil By Mouth' that stay with you, that you never forget. I'd like to leave a few of those behind if possible.

I'm not a pin-up, thankfully. I'm not suggesting I feel unconfident. I am beautiful to my husband. I am beautiful to my friends. I feel sexy and all those things with the people I love.

You can over-think things. If the script's good, everything you need is in there. I just try and feel it and do it honestly. I also don't learn things for auditions, because I feel like it's just a test of memorising rather than being real.