I want to make a clear distinction between people who take acting seriously and people who call themselves actors because theyve been on reality TV or something.

Quiet people, people who arent given to emotional outbursts, people who are economic with words - theyre also fun to play, but you find yourself needing a laser precision in those roles. Otherwise you just sort of stand around, looking slightly brain-dead. You worry about being uninteresting.

My parents were incredibly inclusive.

There are ways of avoiding becoming tabloid fodder and therefore giving people license to pry into your private life. And there's a distinction between being an actor and being a celebrity. You may become a celebrity through acting, but you don't need to do so.

Dramatically it's always more interesting to conceal rather than reveal things.

Of course the lower classes have always felt downtrodden and aspired to a better life. But there is this theory that people respond to a class structure in England - there was a time when people knew who they were and knew whom they served and as long as management wasn't abusive, it was a good life for people.

It was pretty daunting. Normally, I never go to a gym, but before we started shooting, I thought I'd better. I reckoned I was in really good shape, and then I looked around and I was half the size of everyone else. A lot of these American actors have this - in my view - misplaced view that they have to look like Action Man. The trouble is, they all run the risk of being interchangeable.