We get a successful television series or something, and next season they give you less time and less money, which is something I've never really understood. That doesn't happen with Game of Thrones.

Because [writers] Dan Weiss and David Benioff have done such a great job in adapting them, that's what we work with. It serves no purpose to anybody for actors to come onto a set with a well-thumbed copy of the source material and start querying why this or that line has been left out of the script. It's probably been left out for a good reason.

But the quality of writing in the series [game of Thrones] is paramount. That's probably why all of us are involved in this and all of us are quite so loyal to it, because we don't have to expend a lot of energy trying to make a silk purse out of a pig's ear. The quality of the writing is really good, and that's what makes playing a character so enjoyable, whether he's heroic or villainous.

A car to pick me up every day, a chair with my name on it, everybody being very polite... what can you do except sit back and watch it all, try to take it all in?

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.

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.

Power is always a corrupting influence. In this mythical time - let's call it medieval, feudal - people in power are dictatorial and don't want their positions of power to be threatened.