"My mother told me about one of the newspapers at home, with the headline 'Bulgarian Pride'," Stan says, smiling broadly, "so that was nice."

"When I met Mike Newell he asked me what drama school I went to," adds Katie, "and I told him then that I'd never acted before. He said 'flipping monkeys', which I clearly remember. That's when I realised I had a chance of getting it."

"I was pretty sporty in school," Robert explains, "but I'd been doing movies for six months and in that time I hadn't done much exercise. I hadn't even run for a bus for about six months before I started doing Harry Potter. So I went into it a little unfit.

The costume designer said something, when I was trying on the swimming trunks at the beginning, and she said, 'aren't you supposed to be fit?'.

Then I got a call the next day from the assistant director saying that they were putting me on a personal training programme. I thought that would be pretty cool, because it would make me take it seriously."

"I was at the BAFTAs on Saturday night and it was amazing how a couple of people came up to me and said, "I'm really upset that you haven't cast me yet!"" says David.

"Chris [Columbus] would say, 'Turn to the left, turn to the right, eyes wide open Dan,' and now they're discussing the character motivation from a depth that they hadn't for the other two [films]." says David.

"Mad-Eye Moody's make-up was very difficult because it's such a ridiculous looking image, but you have to make it believable. Originally they were talking about CG-ing the ffect and we really fought against that because we wanted it to be something Brendan Gleeson could actually work with, although the eye itself he's not operating." explains Nick.