It was a movie [The Railway Man] that stayed with me a long time. It's still one of the things I'm most proud of. I got to know the man that I was playing and unfortunately he passed away just before the movie came out. It's one that meant a huge amount to me, and one that I'm particularly proud of.

Each year we go to the Cannes film festival and I tend to have all my friends pile in the back of my car and we'll drive from London. The poor production company think they're only putting me up and suddenly they've got eight people sleeping on my hotel room floor.

The work my mum does, a lot of it is re-housing homeless people, that's a real job. I play make-believe and dressing up for a living!

I've been very reluctant on the Twitter front. But I do Instagram now, so I'm slowly coming around. I'm quite a private person, so much of what I do for my job means that I have to be quite public so I'm just nervous about everything being public. I might turn around. Three years ago, I was against all social media but I actually really enjoy Instagram now. Who knows? I never say never!

I'm an expert at killing time on planes now. I do a lot of reading. My secret sort of nerdy side is I'm quite into history so I read a lot of history books. Now I write for a few things and I've had a few history things published, which is cool. I indulge my nerdy side and it's kind of as far away as you can get from the acting world so that's nice as well.

All actors have to change their name.

I actually collect old First and Second World War memorabilia.