I find that what doubt does, or fear, is it makes you come up with as many ideas as you possibly can. And on film that works 'cause you're then handing over that fear to the director, who has to make sense of all those options!

Most actors hate watching their own films because all you can see is the glaring mistakes, your own tricks and ticks.

I walk around talking to myself in accents. Usually people look at me like I'm a complete fruit loop.

It's the weird thing Eton does - you're at school next to lords and earls and, in my case, Prince William, so you end up being used to dealing with those sorts of people.

I love the Potter films. I found them the most wonderful sort of escapism every year or two.

People ask, "Do you enjoy acting?" But you only have those specific few hours to do a scene, and then you drive home and wait for six months to find out how it went. You can't go back and put in a new idea. Filming is about continuing to be alert and to think, and I find it quite exhausting. Certainly I would say that fear is a part of that.

The fear of messing up is what makes you work harder!