There is so much that must be done in a civilized barbarism like war.

The war on terror is the most insane and immoral war of all time. The Americans are doing what they did in Vietnam, bombing villages. But how can a civilised nation do this? How can you can eliminate suspects, their wives, their children, their families, their neighbours? How can you justify this?

It was quite a European war until 1917, when the Americans joined up. They don't have the same sense of the loss of innocence and the cataclysmic loss of life. A whole generation was wiped out.

I always found the extraordinary loss of life in the First World War very moving. I remember learning about it as a very young child, as an eight- or nine-year-old, asking my teachers what poppies were for. Every year the teachers would suddenly wear these red paper flowers in their lapels, and I would say 'What does that mean?'

I did a production of 'Journey's End,' an RC Sherriff play about World War I, at the Edinburgh Festival. I was 18 and it was the first time that people I knew and loved and respected came up to me after the show and said, 'You know, you could really do this if you wanted to.'