I think I've had very knee-jerk emotional reactions to things, and sometimes I've said things without thinking. Being overly emotional clouded my judgment.

You can perfect genius because genius is not perfection. On his level and his practice and his methodology, it's almost inhuman. So, that's been a fantastic arc to play, and boy does it go somewhere in this series.

I am shortsighted. I need glasses for watching movies or concerts. It's not a hipster affectation; I do have poor eyesight. This is how ridiculous my life is: I've had the test for contact lenses, but I haven't found a half-day where I can go to the optician.

It's very easy to be cynical about any kind of interference in things that are beyond our skill set.

My own grandfathers were a submarine commander and a 'desert rats' tank operator in the Second World War.

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.

'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.