When actors aren't filming they just go to their dressing rooms and relax.

We would choreograph [ with Paul Dano] before each scene [in Swiss Army Man] and very quickly got to a place where we could improvise physically in scene and know that the other person would respond in character appropriately. So that [dynamic] was a lot of fun.

Richard [Griffiths] was by my side during two of the most important moments of my career. In August 2000, before official production had even begun on Potter, we filmed a shot outside the Dursleys', which was my first ever shot as Harry. I was nervous and he made me feel at ease. Seven years later, we embarked on 'Equus' together. It was my first time doing a play but, terrified as I was, his encouragement, tutelage and humor made it a joy. In fact, any room he walked into was made twice as funny and twice as clever just by his presence.

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.

Also I just think I've been lucky enough to have great parents, and I've had good people around me who have always been honest with me, who would give me a purely metaphorical slap if I ever got too big for my boots.

The one piece of advice I would give to any actor is, if you want to go out on the street without being recognised, without even being looked at, go out with a 6ft 8in beautiful transsexual. No one gives you a second glance. Especially when you're 5ft 5in.

I'm thrilled of the acceptance I get abroad. The people are so hearty, warm and grateful and I feel privileged having seen so many countries and some of the greatest monuments.