It took time to really build myself a reputation as a good live performer, a musician and an artist.

Every day I'd say I look different. Sometimes I look really formal, sometimes I love the classic Stella McCartney, Chloe Sevigny and Gwyneth Paltrow thing. Other days I like being rock star and wearing leather jackets and studs. I love wearing Burberry - it's the perfect combination of formal and punky.

I wrote 'Lights' a long, long time ago. And I expected it to be on the album, because it was - I wrote it with 'Biff' Stannard. And he wrote every single Spice Girls song and every single pop song of the 90s, basically. So I thought, you know, I was really lucky to work with him, but I didn't think it would be a big song for some reason.

I was super brainy and a proper geek at school, but there would always be a boy. But that sort of obsession did turn me into a songwriter. My writing has always come from that feeling of infatuation.

Even when I'm in quite a happy state of mind, I like writing really sad songs. I think a lot of people do.

My fans are so funny, they make me laugh so much. I've got some really, really, funny, clever fans.

I don't think there was ever a moment when I was like, 'Yeah, I want to be a singer!' I guess it just happened. I performed a lot when I was younger and stuff, but I remember getting to the point where I thought I might have to get a normal job.