When I write, there are times -- not always -- when I hear John (Lennon) in my head, ... I'll think, OK, what would we have done here?, and I can hear him gripe or approve.

Some people don't believe in climate warning - like those who don't believe there was a Holocaust.

The most important ingredient to making a song work is the magic. You've got a melody, you've got words, but on the more successful songs, there's a sort of magic glow that just happens and you can feel it happening. It just makes the songs sort of roll out.

I never really got on that well with Yoko anyway. Strangely enough, I only started to get to know her after John's death.

Looking back, I think I was always musical. My dad was very musical, and I think my mom was musical.

You see, my mother was a district nurse until she died when I was 14, and we used to move from time to time because of her work.

I'm a pretty hands-on dad and make the most of my custody. I take care of my little one whenever I can, and she determines what I can do and where I can do it.