I think acting is something that is within you. It's a very natural thing for me. It comes from myself, really.

I think when you get on with the actors that you're working with, even if you do have really intimate scenes, as long as you get on well, and have a bit of a laugh while doing it, then it's fine.

I've basically grown up with Harry Potter, as so many kids my age have. It's kind of a part of my life.

I don't feel isolated on a film set. In a way you do because you don't really mix with the outside world; you're just sort of working non-stop for a few months, but you've got so many people around you.

We've done a lot of films now about the IRA, we can move on from all that. I loved '71 because I think it showed a very honest trail and what it was actually like. It wasn't one-sided. I really respect ['71 director] Yann [Demange] for what he did. But we have done a lot of those things.

When I was younger, I was very athletic and I always loved sports and physical things.

Vampire teeth really aren't very efficient, are they? It looks very messy. I'm not sure it's the best way to get a pint off anyone.