You always get told how important the premiere and doing the press is, but I have suspicions.

There are far more good actors than there are jobs for them, so it's a big question of luck.

Jennifer [Lawrence] is amazingly grounded in the midst of all this to do. It must be unnerving and hard to relate to the amount of attention she generates.

I do always feel very proud and flattered by being asked to be a part of American productions playing American characters.

When I told people I was going to be doing the movie and the voice of Dobby, they were kind of awestruck, the people who knew about Harry Potter. I felt rather guilty that I didn't really understand the scale of the job I was about to take on. Now, I am well aware of what I'm doing, and actually, it feels a very serious acting responsibility.

I had to change the shape of my own voice. It was quite hard to pull off and so once I had it, I stayed in Hitchcock's voice all day on set.

It's hard to imagine anyone interested in film not being a fan of Alfred Hitchcock because he's such a key influence on the entire history of cinema - it's hard to escape his shadow.