When I am playing a role far away from me with an accent that is not mine I always employ a dialect coach. I am almost always playing someone that has an accent that is not mine.

You're always looking for roles and other creatives who are going to be challenging to you, because you're always a better actor after the experience.

I truly believe that one of the things that has been lacking in America is a spirit of repentance about the injustices of slavery and the injustices of segregation and racism generally. I truly believe that we cannot come to a place of reconciliation until there is individual repentance and corporate repentance.

The thing that would probably surprise most people was that Dr. Martin Luther King was a very reluctant leader. He felt very shocked at times that he had been chosen for this path, but he also understood that he was chosen for this path. He had several moments of acute doubt as to if he was up for the task - when people were injured in the protests he took it very personally, let alone when they were killed.

I know I had my equivalents in Adrian Lester and Lenny James when I was at drama school. I remember David Harewood doing 'Othello' at the National, and Adrian Lester having done Cheek by Jowl's famous 'As You Like It and Company' at the Donmar. Not necessarily performances I saw, but just the fact they happened was massively encouraging.

I truly believe slavery is why, as a by-product, we still have a disproportionate amount of black men incarcerated in the USA. It is an extension of that legacy, and that's not going to start to diminish until black people have a new sense of themselves that isn't tied to slavery and feeling inferior. I think the church can be instrumental in that, in terms of repentance, reconciliation and just being more embracing of each other - not just on Sunday, but in life generally.

I think it's vital to have something outside your acting to keep you rooted in the real world, and help you fill the vacuum. If you have nothing else, it can be unhealthy. For me being a Christian has been invaluable: it simply means acting isn't the centre of my life.