My mother was a stay-at-home mom until I was about 11, when she got a job - and it was like a light came on inside her. It's not wrong to be passionate about your career. When you love what you do, you bring that stimulation back to your family.

It's not easy to reach the summit of your career by the age of 24 - and for the years after to be a humiliating scrabble downhill.

My son was about five or six months old, and he was ill, and I was sent to New York to interview three people back to back. I got home, and I saw my baby. He had been very ill, and he was on three kinds of antibiotics. I'd been away for eight days. I looked at him and thought, 'What am I doing? I'm a terrible mother and a terrible journalist.'

One thing that did give me pause for thought, when I told my female friends now that I was writing about a 13-year-old girl, without exception they all said, 'I would not go back to being 13 for a million pounds.'