I felt, you know, body and soul, as it were. But, of course, I mean, I - at that age, I didn't think in terms of being professional. I didn't know anything about it. That happened later.

I think particularly Daniel [Radcliffe], he knows what he's doing. I'm sure he'll finish up a producer. He really realized what it was, knew the size of it. And it was gigantic, the biggest franchise [Harry Potter] in history.

If I hadn't been a part of [Harry Potter] I would have been deeply upset.

It's a great relief to feel that you're working with someone rather than for someone. You don't feel that you're being tested, as it were.

I remember once when I told Lindsay Anderson at a party that acting was just a sophisticated way of playing cowboys and Indians he almost had a fit.

I've got plenty of train memories. I was sent to school when I was eight years old in 1948 in Kent. So I had to go through London in 1948, just after the war. Many ,many strange experiences.

I think you can fan the flames, but I think in the same way that a mathematician is a mathematician - He's not taught to be a mathematician. He either has a feeling for equations and an understanding and delight in it, not only in the purity of it, but in its beauty as well.