There's a huge amount of footage of Julian [ Assange] online, but he's usually in presentation or defending mode, talking about his cause, or the revelations which Wikileaks have brought about. There's none of Assange relaxing or in private mode. There's none of the personality I tried to give him behind closed doors [in The Fifth Estate ].

I love theatre, and you learn too much as an actor and enjoy too much of it not to want to go back a lot.

It was great. I got to hang out with him [Martin Freeman as Bilbo Baggins], and I kept a straight face for a bit and then I started giggling because I know Martin, I don't know Bilbo. For Martin to be sitting there playing Bilbo is amazing. He's going to be amazing, he's going to be fantastic in this film.

I'm always playing characters with intellects profoundly superior to mine. That's great fun, even though it's as much a fantasy for me as for the people watching me.

You let things run in order to have some sanity and be able to do your work and not feel pre-judged.

There's still nearly the same amount of slavery, if not more, in the world today, as there was at the height of the slave trade.

I'll always do 'Sherlock' - it's something I'm not going to give up on.