When I get into trouble at school I'd like to take an invisibility cloak, drape it over me and sneak out the door. Or I'd like to have a 3 headed-dog because then no one would argue with me.

If I can make a career for myself after Harry Potter, and it goes well, and is varied and with longevity, then that puts to bed the 'child actors argument'.

Some people are asking me questions like this is a more shocking subject, which is so strange.

My favorite phrase, that a friend of mine who worked on the Potter films and was a lot older than me would use in front of me, and I picked up from him many great phrases - the English have a lot of great idioms for sweating. I don't know why that is. But that's what we do. I feel like it's particularly our country; probably everywhere has a lot of idioms for sweating. He always said, "I'm sweating like a glassblower's asshole," which I always found an incredibly strange and yet vivid image.

The nerds are the ones that make the films and do loads of other really cool stuff in their life.

My idea of relaxation is not lying down by a beach. I have to move around, do stuff. Though I'm a massive quiz show person.

And the people I'm best friends with on the films are not generally the actors.