Second films are, you know, like 'difficult second albums', so it's a tricky position to be in but I think he's made a highly accomplished film.

After 'Kong,' my knuckles have never recovered because I had to wear very heavy weights on my forearms and around my hips and ankles to get the sense of size and scale of the movement of the character You are telling your body that you are these things and that you're feeling these thoughts and that you're experiencing these experiences.

Playing a character in a video game is different to other performances because your character can't lead the audience of players in one direction.

What you can do with visual effects is enhance the look of the character, but the actual integrity of the emotional performance and the way the character's facial expressions work, that is what is going to be created on the day with other actors and the director.

In a personal way, to do with family and the father-son relationship, in a kind of artistic way with regard to him being an art student. I also studied the visual arts at Lancaster University. I then decided to become an actor as he was becoming a musician. And then as an actor/performer, we have similar sort of interests - music hall and that whole world. So, there's a lot that I felt connected with.

I love, first of all, reading and discovering what the common perception is and then trying to figure out... well, how does your life cross over into that character, or what's an angle on this that might challenge the status quo? It's just a great journey as well as an education. You're constantly being educated - it's like I'm back at school and making up for lost time.

Not a day goes by where I'm not reminded of Gollum by some person in the street who asks me to do his voice or wants to talk to me about him. But because 'The Hobbit' has been talked about as a project for many years, I knew that at some point I'd have to reengage with him.