What's not to look forward to? It's like all the actors in all of the films. It's difficult to get Martin Freeman and I in a room together. Imagine what it's like to get myself, Chris Hemsworth, Robert Downey Jr., Elizabeth Olsen... these extraordinary actors who all have careers outside the Marvel Universe.

Being on set is quite difficult, because it's so big and you've got to try and relax, which isn't easy when you know you're in a massive film. I was terrified for quite a long time.

Landing the role of Stephen Hawking was the most positively surprising thing that has happened to me.

Conan Doyle is amazing in the way he has Watson describe Sherlock’s posture, mood swings, his hand gestures, and so forth in the novels.

Enjoy the journey of life and not just the endgame.

I'm always keen to use my body in my work, so I'm looking forward to the motion capture for Smaug. Both Gollum and King Kong were primates, whereas I'm playing a serpent, so it'll be interesting - I'll have to tie my legs together, possibly, or else they'll be kind of splayed out to the side as a reptile's should be.

I drag a lot of stuff round with me that I don't need.