I think the part of my acting career where I've been more successful, I've been incredibly cushioned. People are much too nice to you. You go into politics, and people are absolutely brutal. You've got proper enemies, and they're vicious. It's very invigorating.

Frankly, I think I'm marvelous in rehearsal! Then you turn the camera on, and it gets stiff and tight. And then you trudge back to your trailer feeling sad. That's been my experience of film acting.

I think, to be a successful author, you've got to be part recluse and part show-off.

If you do too much acting in a lead part in a feature film where you're 40 ft. high, it's rather unattractive. You can see the acting. And it's actually the right thing to do to bring as much of yourself, I believe, to the part as you possibly can - to minimize the amount of theatrical stuff that you need to do.

And film acting is incredibly tedious, just by its nature. It's incredibly, mind numbingly slow.

I think substitution is a huge part of acting, but I don't personalise my work that much.