I wish I could have hung out with Patti Smith in the seventies, and also have some crazy times.

I feel like sometimes I'm so positive and sometimes I think the worst of everything or I think the worst is going to happen. It's how I deal with stuff day-to-day, it's just how I get by really, and it's probably not the best way to be.

I started getting these attacks in 2009, just as my music career was taking off. I'd be doing photo-shoots and started to feel like I was having heart attacks. Increasingly I found it difficult to step outside my flat. Things started to get better after I saw a therapist, who told me I needed to make peace with my panic attacks.

You should constantly write because your writing is always evolving and progressing. It's really important to start writing young.

I met Prince William at a musical festival and he let me know he was a fan of my music. But the invitation to sing at his wedding reception came completely out of the blue. The fact that Kate and William knew the words to my songs was very touching.

My mum was too busy raising four of us to encourage my hopes. But I'm glad I had the upbringing I did. It made me a worrier and a thoughtful, curious person.

I think I'd like to be best friends with Björk, because I'd like to pick her brain a lot all the time and just have weird times together.