Like most meaningful activities, campaigns are team games.

All of this is happening because there has still been no reckoning post the financial crisis. So governments have fallen, one bloke has been to prison, the banks have gone pretty well back to status quo, the rich are getting richer, and the poor are getting poorer. And it's fuelling anger. And somehow [Donald] Trump, who represents the worst aspects of capitalism, has persuaded people he can deal with that.

So here is one of my theories on happiness: we cannot know if we have lived a truly happy life until the very end. This view of life and death was reinforced by my close witnessing of the buildup to the death of Philip Gould. Philip was without doubt my closest friend in politics. When he died, I felt like I had lost a limb.

Friends have suggested that I am the least qualified person to talk about happiness, because I am often down, and sometimes profoundly depressed. But I think that's where my qualification comes from. Because to know happiness, it helps to know unhappiness.

My dad, Donald, was a vet and had a practice in Yorkshire. Cats and dogs were his bread and butter, but his greatest love was large animals.

The media are obsessed with spin doctors and with portraying them as a bad thing, yet seem addicted to our medicine.

I do think it's strange that I get associated with Iraq more than the people who were Foreign Secretary or Defence Secretary. It's because of my closeness to Tony [Blair], which I don't regret at all. I think that was a privilege.