Then there's your diet. You cut out sugars, fat, soy sauces... anything that's nice. Tea and coffee is replaced by boiling water with lemon. It's amazing how quickly you get into it. There's also herbal tea and a lot of water, obviously... about two litres a day.

The only thing I can do is wipe my arse, brush my teeth, turn up and do the best work I can.

I'm from East Sheen, I went to public school where I learned Latin at the age of nine, and certain expectations were made of me to go to St Paul's, Oxbridge maybe, and all that kind of thing. And I failed systematically to meet the mark - who I am and what I should have been are two very different things.

And I like people. I like to know what you're really up to. I'm a bit of a nosey busy body. Why do they do the things they do? Why are they prepared to do the things they do to get what they want? When? Where? Who?

As actors, we have the opportunity to work with many directors. Directors only work with themselves and other actors. They never know what it is like to work with another director. So that relationship that one has with a director is entirely always the king.

I had no immediate knowledge of the world of Batman at all. I'm quite incubated. I just keep myself to myself and my dog.

There's an abundance of exposure when you start working in American films. Inevitably you become a brand and that has to be controlled.