The thing about film is it is a very precise form. You know if you have it and you know if you don't have it. There's not really a middle bit where you're like, "I think we kind of have that scene."

I like to disappear into a role. I equate the success of it with a feeling of being chemically changed.

I wanted to be an actor ever since I got on stage for the first time, aged 13. Before that, I thought I might follow in the medical footsteps of my parents: my father was a doctor, my mother a pharmacist.

I do like sci-fi. When I was a kid, I was always sort of locked into sci-fi stories. So, sci-fi has always had a special place in my heart.

I like finding things out beforehand, because I'm nervous in disposition, and I worry that if I don't do anything, then I'll turn up and I still won't really have a sense of it, and it might be too late. So I like to get things as organized as I possibly can in my own head, to apply myself to the work before arriving to a late-in-the-day rehearsal, or in extreme cases, the first day on set.

I would love to be a fly on the wall watching other directors and actors to see what their process is like.

Solomon Northup is one of the most remarkable people Ive ever encountered in my life; one of the most amazing stories I have ever been in any kind of contact with. To not tell that story would have been disgraceful, in my opinion.