I think that London is very much like that. I find there's humour in the air and people are interesting. And I think that it's a place which is constantly surprising. The worst thing about it? I think it can be smug and aggressive.

When I visited coffee farms in Ethiopia, the farmers could not believe we spend a week's wages in their country on a cup of coffee in ours, because they see so little of the profits. Oxfam's fair trade campaign helps right this wrong.

I have a great deal of respect for the craft, I don't know how much respect it has for me. But it's a precision process. Doing it on stage would be, I think, terrifying. Doing it on film has its own difficulties, because film is not conducive to spontaneity. You might have a run through and get a few chuckles at eight o'clock in the morning, but you don't keep laughing at the same thing all day long.

Certainly, from where I stand, I'm not a specialist in wildly different walks and voices. But I find as much variation and nuance as what satisfies me in what I do. So, I don't find this particularly different. He has his own peculiarities. You're probably talking about a cluster of Englishmen in suits but I've done quite a big cluster of guys not in suits as well, which I've occupied myself with. So, I don't find that this is the one that stands out.

I thought I was managing my expectations, but on hearing the news I discovered new and unfamiliar vocal tones. Perhaps I should do another musical.

It's whether they have a vision and whether they're able to communicate it. The best director is just someone who gets over-excited about doing it - they don't even have to know much about camera or acting.

But this is where you get all the market research and things get in danger of becoming formulaic, and where you depend on brands and getting recognised actors. It's the thing that precludes risk very often, otherwise everyone would be avant-garde all over the place.