'Sherlock' fans are, by and large, an intelligent breed, so they've gone through my back catalogue and got what I've done, why and how I've done it. There is some obsessive behaviour, but I worry for them rather than me.

I think what I loved in cinema - and what I mean by cinema is not just films, but proper, classical cinema - are the extraordinary moments that can occur on screen. At the same time, I do feel that cinema and theater feed each other. I feel like you can do close-up on stage and you can do something very bold and highly characterized - and, dare I say, theatrical - on camera. I think the cameras and the viewpoints shift depending on the intensity and integrity of your intention and focus on that.

I'm a Prince of Wales Trust ambassador, so I'm all about giving youth an education, a voice and a chance to not take the wrong road.

My first agent dissuaded me from calling myself 'Cumberbatch.' I had six months of not very productive time with her, so I changed agents. The new one said, 'Why aren't you using your family name? It's a real attention-grabber.' I worried, 'How much is it going to cost to put my name in lights?' But then I decided that's not my problem.

Enjoy the journey of life and not just the endgame.

I'm not one for doing the children's party version: "Hi, I'm a character in a movie and now I'm in reality!" I was doing the last shot of the film before reshoots outside their shop. I was starting my run into the frame and I thought, "You are literally ending where this began. The loop of serendipity's too much to not go in and acknowledge it." I just wanted to see the look on their faces.

It'd be really nice to wake up looking like, I don't know, Jake Gyllenhaal and think "Let's try this on for a day and see how it feels.