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.

I got live tweeted once by someone who was opposite my home in some rented accommodation. He was actually describing on twitter what I was doing. 'I took a shirt off, I went to the window, I put a shirt back on... ' And I've got blinds in my flat!

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.

[Season 4 of Sherlock Holmes will be] myopically dark. You're talking about the end of the universe darkness. You can't see in front of you and would walk into everything dark.

I've been broody since I was 12, but I can't just get anyone pregnant. It has got to be the right person.

I'm aware of the power of looks. I've wanted to play roles that have gone to much better-looking people and you just think 'Oh well, that's the pin up guy's an actor like my friend James Mcavoy, who's gorgeous on screen. I'm not that. But at least I don't have to worry about taking precious care of my face because it's my commodity. That's a great freedom. I'm not afraid of being heinous for the sake of a part

The generation now below me were born into a world where if you're a kid with raw talent now, you can roll in and land a lead in a Scorsese film. You don't have to have prove yourself by working up the ranks, doing the classics, and getting the canon under your belt in the way the great Sirs and Dames of mom and dad's generation - the [Ben] Kingsleys and [Helen] Mirrens and [Anthony] Hopkinses and people of that ilk.