MB: After seven years, have your feelings changed towards working on Harry Potter?
CR: It's less daunting in the sense in that I know what it’s like to work on a film now and I know the character inside out. But it's daunting in that you go in everyday and you’re working with some of the best actors in the world.
But it's a lot of fun. You're made to feel very welcome and at ease.

MB: What's the best thing about going back to the world of Potter?
CR: It’s many things. Working on Potter is something that I've always enjoyed.
Playing Percy is a character that I really enjoy doing. He's so horrible, sleazy and slimy that I really enjoy playing him, so I kind of missed playing him [Percy's character wasn't required for The Goblet Of Fire].
Also, working on Potter, has been the same set of people for the last seven years. So you're going back to work with the people you know, the people you're friends with.

MB: You spent a lot of time on the set for the Ministry Of Magic.
CR: Yes, that was the set where I did 50 per cent of the scenes I'm in. It was huge and stunning. It was like an old fashioned underground station.
The weird thing was we filmed the battle scene – where the ministry arrives at the end of the big fight and the whole place is covered in smashed glass - it was bizarre as we did that first.
Then the props and set people came in and made it all tidy again and did the other stuff afterwards – but that's the weird way films work.