You always get told how important the premiere and doing the press is, but I have suspicions.

Certainly for my father, there were great times, good times, not-so-good times. He might be shooting a Fellini film for six months, then not working for two months. I'm used to that dynamic.

When I told people I was going to be doing the movie and the voice of Dobby, they were kind of awestruck, the people who knew about Harry Potter. I felt rather guilty that I didn't really understand the scale of the job I was about to take on. Now, I am well aware of what I'm doing, and actually, it feels a very serious acting responsibility.

The script for 'Infamous' was so poised between tragedy and comedy. It's a dream part. One reads those scripts with a sense of melancholia. When you read a script that good I remember thinking, 'Oh, this script is too good. They'll never give it to me.'

I do always feel very proud and flattered by being asked to be a part of American productions playing American characters.

It's always very strange to have your life dramatized because it never happens like that. Things will be different.

I teach for the Book Trust, which promotes reading and writing with children.