You do get really exhausted doing films. You work such long hours, and after a while, things can get out of perspective, just like if anyone's tired, things get on top of them.

Usually, there's a story I've told that leads up to why I'm singing the song. The whole concept of the show was about being authentic and connecting with these songs. The best way to do that was in a room with an audience and for people to listen to that.

I actually find in America, there's a slight snobbery about actors who go back and forth between big heavy dramas and popcorn fare. That always intrigues me, because that doesn't exist in the same way in Britain. And I imagine it would be worse. In terms of the sort of class, and the sort of snobby, slightly on the back-foot thing Britain has. But it's much more prevalent in America. I'm really intrigued by it. I don't know why that is. But I'm aiming to break down those barriers by being in a Shakespeare film and a Smurfs film within six months of each other.

I think people deny themselves by putting themselves into categories.

I had to be a grown-up when I should have been a little boy, and now that I'm a grown-up my little-boyness has exploded out of me. I've lived my life backwards.

When you're on TV, you come into people's homes. In theater and film, they go to you - to the temple of the cinema or theater. And it's very different.

Performing a one-man Macbeth feels like the greatest challenge.