Determination becomes obsession and then it becomes all that matters.

'Great Expectations' is one of the greatest stories.

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!

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.

With a horror movie most of the actual jumps and scares are made in the edit. It's often not very scary on set and then you watch the film and suddenly it's very scary because the way the jump scares fit together building up the suspense in the audience because it's making them jump when they're least expecting it.

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.

When I was growing up, there was a man who gave me lessons and things. I'm very dyslexic so he used to give me extra reading and writing. And he always knew that I was interested in stuff but he never told me that he was in the Second World War himself. One day he gave me his helmet that he had worn through the North Africa Campaign. It was just before he died. So I've got his helmet. That was pretty special to me.