My sons have to learn that you take the rough with the smooth and they've seen a lot of smooth in the years that they've been around. They didn't see the early years. But both my mum and myself are actors and we constantly tell them it's not easy. But they understand that.

We've never had nannies. We've had great grandparents, great support from family, and the kids have been on every set: they've seen me play Gollum, King Kong, Captain Haddock, the lot. They totally get it, and they want to go into the business. Ruby, my daughter, is very keen to become an actress.

For film and games, there is now a fantastic method of actors portraying characters which don't necessarily look like themselves. And yet you've still got the heart and soul of the performance.

'The Hobbit' was one of the first biggish books I ever read. I remember vividly the 'riddles in the dark' passage, and it meant a lot to me to finally get to play it after all these years.

People are mystified by it and so they kind of think, the acting community thinks they're gonna be replaced by CG characters and animators think they're gonna be replaced by performance capture (and) a lot of directors, particularly European directors, who have no experience of it.

I love the whole kind of notion of transformation for me is (what) excites me about not only acting, but storytelling. I love, I love that notion of a slightly larger-than-life artistic truth, you know, magnifying real emotional truth (or) finding something about human condition (which), you wouldn't necessarily think you can learn from characters such as Kong or Gollum, but actually they are, you know, these huge amplifications of a human psyche and I suppose those kind of roles have always attracted me definitely.

That's what I think is the biggest challenge, is just being still and learning how to just be present in that stillness and not over do it, not over act.