The wedding ring on my left hand was bought by my grandfather, Samuel Miliband, in Brussels in 1920. I never knew him, as he died when I was one. But his ring was kept by my aunt until it was placed on my finger by my wife Louise 32 years later.

If you decide to run for the leadership, you have to go through it with the people you love. But you also have to protect them and I am determined to protect my mum.

I think the wonderment of seeing my two sons developing makes me incredibly optimistic about human potential. It makes you think: 'My goodness. It's a miracle that's going on here. What could the human race do together?'

Today, the UK must be the pioneer of a new model of economic change, that integrates social and environmental consideration. This is not just a question of values and moral duty. It is about our economy's capacity to sustain itself

What's now urgently needed [to stop environmental disaster] is the international political commitment to take action to avoid dangerous climate change.

The biggest opportunity in 2013 is in Africa. It has seven out of the ten fastest-growing economies in the world. In Nigeria alone there are 100 million people with mobile phones. In total, 300 million Africans - five times the population of Britain - are in the middle class.

And the truth is, those who are terrorists only have to succeed once, and those of us who are trying to build an inclusive society have to succeed every time.