Potter for me is something that's been giving me these amazing opportunities to start a career and learn while I'm doing, which is the best way to learn.

I basically have the diet of a 19th-century Irish navy, apart from the litre of stout a day. It's meat and potatoes and bread and cheese: those are my four food groups.

My dad's got a brilliant eye for scripts 'cos he's a literary agent. He and my agent read a load of scripts and filter them.

I'm not an easy person to love. There are lots of times when I'm a very good boyfriend, but there are times when I'm useless. I mean, I'm a mess around the house. I talk nonstop. I become obsessed with things.

I used to joke I was a point-and-click actor. My whole process has been about trusting your instincts and hitting your mark.

I think I have just always had an awareness that when you go to a premiere and people start cheering and shouting your name and stuff, they are shouting at a perception of you that they have.

Fame is damaging when people become reliant on it for their sense of self, and their identity, when fame is linked to how you see yourself.