Have you seen Cowspiracy? It takes a lot more land to feed a meat eater than to feed a vegan or a vegetarian. It's something I'd love to get into but it's very hard to persuade people to stop things they've been doing for a long time. So maybe it needs to start with the next generation. Everyone needs to raise their children with a bit more responsibility.

With our job, you often meet people through work. I've had two long-term relationships, from 14 to 18 and 19 to 21. One I met at school and the other I met on a job so who knows where I'll meet the next person.

As a kid, I used to run around our garden waving a stick and pretending to be a million different people. That's why I became an actor, really.

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.

The movie is so fun. I've done period pieces before but nothing with this twist. And the movie is just full of such wonderful people, such young actors - people like Matt Smith that I've been friends with for a while.

The negative about acting is that you have to spend a great deal of time away from your friends and loved ones.

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.