We know that no algorithm can solve global poverty; no pill can cure a chronic illness; no box of chocolates can mend a broken relationship; no educational DVD can transform a child into a baby Einstein; no drone strike can end a terrorist conflict. Sadly, there is no such thing as 'One Tip to a Flat Stomach.'

We live in a culture that's been hijacked by the management consultant ethos. We want everything boiled down to a Power Point slide. We want metrics and 'show me the numbers.' That runs counter to the immensely complex nature of so many social, economic and political problems. You cannot devise an algorithm to fix them.

There are times when fixing things quickly is the only option: when you have to channel MacGyver, reach for the duct tape, and cobble together whatever solution works right now. If someone is choking on a morsel of food, you don't sit back, stroke your chin and take the Aristotelian long view. You quickly administer the Heimlich maneuvre.

I never wanted to be a public figure. I feel that I always have to dampen down people's expectations. They expect me to be an oracle, wave a magic wand, sprinkle some slow, sparkly dust on them, to make everything all right.