Actors can be many things - vain, venal, self-serving, obnoxious, bullies - but all of the good ones are great storytellers. I wanted to watch what my actors were doing and how they were telling the story.

I feel safe in saying this, and that is that Peter Weir is without a doubt one of the greatest filmmakers of all time. I'd open a door in a movie for him if he asked me to.

In the old days when I first was coming up, you would turn up on set in the morning with your coffee, script, and hangover and you would figure out what you were going to do with the day and how you were going to play the scenes. You would rehearse and then invite the crew in to watch the actors go through the scenes. The actors would go away to makeup and costume and the director and the DP would work out how they were going to cover what the actors had just done.

I do feel that scripts get developed now to a point where they're sort of actor-proof. If the actor is not very good, the narrative still survives because it's all in the dialogue. Not to say there aren't great performances in English-language films, because there are every year, but the 1970s were awash with great performances, and I was wondering whether it had to do with the amount of space and the amount of responsibility given to the actors.

An actor has so much less space and responsibility. Sometimes you come on, and there are already tape marks for where you are supposed to stand, and the dialogue is already decided on. If you want to make a change and contribute something, it has to be approved by a number of people.

An agent friend of mine who will remain nameless said you can't make a romance about homeless people; nobody wants to see them kiss. And I thought, what a repulsive, repugnant, extraordinary thing to say. I had to think about the fact that the world is probably full of other people who feel like that. The very idea that we spend time trying to humanize humans is extraordinary to me.

People have suggested that perhaps we are too affluent to be telling this story, which is amazing to me because then I wonder what story I am allowed to tell. Having been working with the homeless for the past years, I noticed lots of things about them, but one thing I really noticed was that they were probably too busy just getting though the day to make a film about themselves.