I'm taking probably the biggest risk of my career in playing the part in Filth. If you stop taking risks, then you get bored, or you just keep playing the same part, over and over again. Eventually audiences get bored of that, as well.

Basically, every character I've ever played, I've based entirely on internal conflict. And I love doing that, because I think it's very human.

I do find it strange, doing magazine shoots. Photographers always go, 'Why don't you like to have your picture taken? That's what you do for a living anyway. Just pretend you're acting. It's the same thing!'

That's the main thing that attracts me - characters who have big journeys. I like playing those people.

[Macbeth] is historically set in a place depicted by Shakespeare as brutal and violent, incredibly superstitious, and that's something that I do believe is Scottish.

I always have a beard between jobs. I just let it grow until they pay me to shave it. People are quite surprised it's ginger. Sometimes they ask me if dye my hair and I always say 'Wow, no!' I'm 'trans-ginger.'

As an actor sometimes you can be a bit emotional and forceful, and that's not always the way to be.