I looked pretty crazy but at the time, you don't think anything of it. You think, "I've got an amazing job. I'm working and this is cool." I remember I was being fit to go to a premiere for something at Burberry and Christopher Bailey, who designs the clothes there, saw a picture of me and I looked weird. I had short black hair, hardly any eyebrows, I looked very very thin and he went, "We need to put Douglas in a campaign." So four days later, I was shooting a Burberry campaign because he had seen me looking crazy from the show so that was kind of funny.

I love the challenge of playing characters forced on life-changing emotional journeys. To work on a project with Billy Crudup and Sam Rockwell is just a dream come true.

I've had friends who have come away who've said, "I shouldn't have become such close friends with the director." You always want to get on with the director, but I personally prefer a relationship where you respect them - you get on really well with them, but they're boss, as it were. It's about trusting your director, for better or for worse. They're the one's seeing what's coming out on the monitors, so you have to try and trust what they say.

I looked pretty crazy but at the time, you don't think anything of it. You think, "I've got an amazing job. I'm working and this is cool." I remember I was being fit to go to a premiere for something at Burberry and Christopher Bailey, who designs the clothes there, saw a picture of me and I looked weird. I had short black hair, hardly any eyebrows, I looked very very thin and he went, "We need to put Douglas in a campaign." So four days later, I was shooting a Burberry campaign because he had seen me looking crazy from the show so that was kind of funny.

Every year I look at the 'GQ' Best-Dressed List and have thought what an honour it must be to be included. I couldn't believe my eyes when I saw my own face in there.

I fell in love at 14 and I remember that mad, tense feeling and all the mad things you do for the person - all those extremes and all the stuff you don't mind putting up with.

Some people can very easily switch off and be guilt free, not that what I'm doing is about guilt, but they can completely disconnect and not care because it doesn't affect them. I've always really cared about what happens and felt a certain responsibility.