The little song and dance number at the end - that's me, my voice, howling out. It was a new experience for me. I've never sung before and I've certainly never sung on screen. I think I sung on stage when I was 13 and for some reason nobody's asked me to try it again since.

But one of the most fantastic things about Ireland and Dublin is that the pubs are like Paris and the cafe culture. And Dublin, in many ways, is a pub culture.

When something is iconic, if you're very careful and delicate, you can add onto that iconography. It can expand. People have attached so much to it themselves, and connected to it, so the risks are big, but the potential is enormous, at the same time.

There's a saying within the Asperger community: if you've met one person with Asperger's syndrome, you've met one person with Asperger's syndrome ... Within this condition, beneath this label, the variety of personality, of humor, of behavior, is infinite.

Whether it's from the books or the films, there are some people that will have a very fixed idea in their head. You're not going to match that. At a certain point, you have to accept that.

You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.

There's a part of me that wants to look nice and occasionally wants to be snappy, and the other part of me that just wants to wear the same sweater until I die. And I'm in constant conflict between those two sides.