I was quite shy. I used to write stories all the time, and I think that was a worry for my parents.

That's the thing - you do a job like 'Shameless,' and suddenly that's why you can get a job like 'The Virgin Queen', not because of all the classical theatre you've done. But we can be very snippy about television. It's absolutely the most potent and powerful form of storytelling we have.

The first thing that attracts me to any script is the writing. If I find myself becoming lost in a good yarn, then I feel certain that others will, too.

I don't look like Catherine Zeta-Jones, so I don't think Hollywood would be that interested in me, to be honest. I just want nice work.

You want to have enough of a profile to be able to do all the work you can, but at the same time you want to have your own space. But there are a lot of actors who achieve it, a lot of movie stars even, people like Emily Watson and Cate Blanchett. They seem to be able to carry on with their lives and still produce wonderful, high-profile work.

I only went along to youth theatre with a friend when I was young to try to make myself a bit more sociable. But the whole thing was quite sore; it really hurt me trying to get into drama school. It was a world I knew nothing about - it was very middle class; all that usual stuff. But I was young, determined, and I just went for it.

For actors, being successful is generally getting a job. If you can work a lot, you're really successful. If you work a lot on projects that are interesting and intelligent and great fun to be part of, then you're hugely successful. And I feel hugely successful. I can't believe that I get to be involved with the projects and the people I work with.