I think that's important for all ages, to not be afraid of being an individual. I grew up on my own, as an only child, so early on I think I was quite capable of making decisions by myself and being an individual.

I think one thing my mother always instilled in me was a sense of individuality. Being an only child, I never thought I had to rely on anyone. I was never afraid to be alone and I was never afraid to be my own person. So when all my friends were like, "Let's smoke weed," I was like, "I'm not doing it." It wasn't because I was trying to be a rebel or because I didn't like it or I was anti-drugs. I just didn't do it because I didn't want to do it, and if I didn't want to do it, I wasn't doing it. That was it.

I don't think I'm egotistical, and I know what my limits are: I'm a black guy who's probably losing his hair. But I'm happy to play roles that I'm given, and I'm happy to play roles that I write.

The BFI recently did a study of the British films that have the most people of color in them in the last 10 years, and in the top 10, three of the films were my films. I've always been a glass-is-half-full person. I've always gone, "If people aren't going to do it, I'm going to do it".

All the young people grow up too fast and want to be able to do this, or that. When you get to the older age and you have a mortgage, bills, this and that you think: "If I had done that differently when I was younger, then I wouldn't be in this situation now."

I just started to write because I was fed up of not seeing the stories that I wanted, so I was like “Stop moaning and write something.”

It always seems that the generation below you is getting worse, which is why I had the worst character in the film Adulthood that said it. I don't remember speaking to my elders like that, because you never remember... actually our generation was quite bad because everyone else always seems worse.