Inevitably, every part an actor plays contains some of himself.

I don't really want people to see me. I'm not into stardom.

I love playing real people. It's a huge challenge and responsibility which I take on board and which I relish. It also scares me to death. Give me a totally fictional character and I don't have the same sort of responsibility. If, though, I play Sigmund Freud or Robert Maxwell or whoever then there is a responsibility.

I love seeing my characters big up there and I would have liked to have reached a different public in movies from my television public. There's still a part of me that wishes that my character range could be seen on the big screen. Rather, as Rod Steiger was, because he was a big influence on me - about becoming other people and not worrying about your own glory or self esteem but sacrificing yourself to become somebody else.

When I was 18 and not sure whether I wanted to be an actor, I realised that a playwright has no voice without an actor. That's my reason for acting: to get that character as right as possible for my writer. And I have never changed my philosophy.

In The Godfather, for instance, they say they won't deal drugs because they have a code of behaviour. He is the last remnants of that. So playing someone like that, who is also in pain with his kidney stone, means you're beginning to find a dimension of the guy who is king and all show and the private guy who is in pain.

There are clues in the script... he will say "I think drugs are immoral"'... but the guy who says that kills, tortures, pimps and has whores working for him. There is this strange morality going on, which is rather like the Mafia.