It starts with the writing - which is really, really good. And the production values are phenomenal. HBO and Sky have spent money on it, and you get what you pay for. This has money put into it properly - not lavish amounts - but as each season is successful, they maintain the money that's being spent to maintain the quality.

When you get to a certain age, the work begins to thin out.

I was a window dresser for Burton's once. What really put me off was the area manager coming round and saying, Charles, I think you're a natch at this.

On an independent film you're lucky if you get one, but ostensibly the job is the same. There's very little difference, apart from the knowledge that there's a captive audience at the end of it - which you can't always guarantee with a movie.

There is a huge fan base, they're very knowledgeable and very loyal. I was astonished - before I started working on the series I didn't know anything about Game of Thrones. I hadn't heard of the books. When it started going out, people were coming up to me in the street saying [fake cockney accent] "oh, Game of Thrones, f------ wonderful.

Most films are written and made with a hero around 35, or even 25.

It's a question of keeping one's eyes and ears open and watching how other people play the game. They're watching me too, to see what my attitude is like.