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.

Doing a job, or even watching a film, can make a difference to your life, but I don't think it ever has an explosive impact where your life will never be the same again. It kind of seeps into your life, and perhaps realise you're a little more vigilant about certain things than you might have been.

I can't bring you absolute truth in the detailed factual sense. All I can do is bring you an interpretation as I understand it. That's all you can ever get from an actor.

I can actually get involved in getting stories off the ground that no one would ask me to be in because I'm the wrong age, the wrong sex, the wrong nationality, or whatever. I've found it quite exhilarating to have that freedom to tell the stories that aren't just about middle-aged white English guys.

One of my grandfathers, actually, having gone out there as a minister, decided he would better serve the people as a doctor. So at a very late age - at the age of 38 in fact - he changed course and decided to become a doctor.

I do notice that when I've been away and I come back to London. People look at you. People are ready to pick arguments.

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.