TLC: Have you ever improvised on set?

Yeah, sometimes. Chamber of Secrets was interesting. In the Burrow scene, with Julie Walters and Mark Williams, in the breakfast scene, most of that was improvised. For instance the line where Bonnie, Ginny, comes down the stairs and says, "Mom, have you seen my jumper?" and she says, "Yes dear, it's on the cat." Not in the script! The bit where Mr. Weasley says something about, "So, what exactly is the purpose of rubber duck?" I think we did 20 takes, every one was, "What is the purpose of a dipstick, what is the purpose of a lollipop?" etc. So we did it every time something different came out and we laughed and laughed and laughed at that.

With Alfonso, Alfonso's quite literally improvisational, kind of, see what happens, put the camera on, know where you're moving. The scene comes to an end and then he'll keep rolling anyway to see what kind of comes naturally after that, which is always fun, which is why I like working with Alfonso, because he just pushes you.

TLC: Did they all trample you?

Devon Murray pushed me over every single take. I love the boy but, **** it.

TLC: What's the most fun you've ever had on a Potter set?

Burrow or the Halloween scene, the one with Quirrell, which was fun because it went right to take, which is unusual. Usually you'll spend three or four takes just rehearsing it, you'll take a rehearsal take. But this one went straight through to take. None of us knew what Ian Hart was going to do when he ran through that door. We knew what the line was, but when he came running through that door, that was his first take, that TROLL IN THE DUNGEON!

TLC: In the movie, that was his first take?

Yeah, I believe so. So we'd all been eating sweets all day, we're all on sugar highs. Daniel, Rupert and Emma were all, what, 10, 11, at the time. Kids that age, and sugar, bad bad bad bad bad move. And you know what Rupert's like when he gets giggly, we've all seen it.

TLC: Did he?

Yeah. At the end of the day Rupert was just sitting there in the corner going [mimes giggling]. They went through a stage of serving us Red Bull in the games room. Bad, bad, bad. I don't think it was meant for the kids but the kids ended up drinking it and caffeine is bad.

TLC: How many hours were you usally on set?

A good example is the Great Hall scene. For me, that would be 14 hours. They can't work minors until 7 o' clock at night so after that generally I'm free, unless they're doing something that involves Percy; maybe close-ups or whatever, they put the stand-ins in and they have extras that come in late at night so they can film. But they can't work the main cast past seven, I think it is.

TLC: They're getting to the age, though, where it will be okay.

Yeah, once they're 16, problem solved. Muah ha ha.

TLC: What are your predictions for HBP ?

All I know at the moment is that some stage Percy will probably redeem himself, that's what I've ben told will possibly happen. We'll see what happens there. I don't know other than that, I presume we're going to see some romantic stuff happening, certainly with Hermione and Ron, we'll see some more stuff going on.

TLC: Because Voldy is a born cross-dresser.

Well of course. Or Penelope will turn out ot be Malfoy's lovechild or something. Well, they've got the same hair, it's possible.

Percy's not, you know, Daniel Radcliffe. Percy's a secondary principal character, he's not particularly important. People know who Percy is but generally I have to say, "I'm the older brother," or "Harry's best friend's big brother," is how I introduce myself. You know, you put Harry Potter on it, people kind of go, "Oooh."