What I learned in Guinea is that we are all responsible for the state of our world. The world - and the system by which we trade, share, cooperate and conflict - is clearly not working. We are only as strong as our weakest members. UNICEF is run at every level by strong, relentlessly energetic, deeply capable people who use that strength, energy and capability to help those who need it most: the weakest, most disadvantaged women and children of our world. All I can do now is help make people aware of what is happening, of what they are doing. That is all that I can do. For now.

I THINK IF YOU'RE GOING TO BE CONVENTIONALLY ROMANTIC YOU'VE GOT TO GO ALL THE WAY: A BEAUTIFUL DINNER SOMEWHERE LOVELY, WITH BOAT-LOADS OF FLOWERS, CHOCOLATES AND CHAMPAGNE. BUT IT MIGHT ALSO BE NICE TO WRAP UP WARM AND SIT ON A ROOF SOMEWHERE, WITH A CUP OF HOT SOUP AND YOUR GIRL, WATCH THE PLANES COME IN OVER LONDON AND LISTEN TO THE NIGHT.

What's my guilty pleasure? The thing is, I never feel guilty about pleasures.

I thought theater people wouldn't see me if I hadn't trained. I didn't want to just be the Brideshead guy, to spend the rest of my life wearing waistcoats. I got the chance to try everything. Not just Romeos, but pimps and grandfathers and even one role as a woman in a Naomi Wallace play called Slaughter City.

Well, I don't know. When I signed my contract, I signed to play Loki in five more Marvel movies, but they were unspecified. So, if there will be more movies or not remains to be seen, but I like the idea of Loki turning up in the shadows when people least expect him, but you never know these things, the world changes and the things change, but I feel like I know who Loki is, so I wouldn't mind.

In 'Thor,' that was my own hair. I grew it out. But I have naturally curly, blonde hair, so I'll never look like that. By the time I got to 'The Avengers,' I had come off two other films, which required me to have it very short. So I dyed it again and it was long enough to use a part of my hairline.

I was informed yesterday that there's a Twitter account for my laugh. Very hard to get used to things like that. Pretty amazing.