What inspired your new single 'The Devil's Beat'?
"Well, I wrote the song after watching Star Wars. Star Wars is all about the forces of good and evil, so I started thinking about our world and how we've got good and evil, the forces of power and money, and the power of love as well. I suppose 'The Devil's Beat' is when the balance of all these forces is tipped to the wrong side - in this case, the force of nature. There is an eco slant to it, but I guess at the end of the day one would hope that love is the greatest force of them all."
Did you find it hard returning to the studio after the huge success of your debut album, Smile... It Confuses People?
"No, because I never really stopped writing. I'm one of those people that just keeps writing all the time. My life has changed so much in the last few years, with so many totally new experiences that I can draw inspiration from, that I've always had a song on the go at any given time."
It's been reported that you enjoyed the rock 'n' roll lifestyle a little too much during your last tour. Can you tell us about that?
"When the first album was a success, everything that happened after that was something I'd never seen before. The tour bus was a total novelty to me and my life totally changed back then. I think the drinking came from the energy and adrenaline of that period. As a performer coming off stage, you want to keep the energy alive because it's something you don't get every day. We did overdo it a little bit with the drinking and I got told off for it. The telling off actually came from my manager down the phone, and as soon as he said it I realised it was right for a song. Even getting pissed can inspire you to write songs!"
Your manager said you were overstepping the line with your behaviour. Where do do you think that line is before you become a Pete Doherty or an Amy Winehouse?
"I think that it's different for every individual. I think we all have a point where we can't cope. Some people are better than others at living the rock 'n' roll life and still turning up for the gigs. There are bands who've been able to sustain themselves through all of that and are still respected musicians - look at the Rolling Stones and Fleetwood Mac. Drugs and rock 'n' roll have gone hand in hand for decades, but I guess it's obvious to the people around you when it's gone too far. Amy Winehouse has obviously gone too far, and when it starts to affect your music and health, that's where you draw the line."
You received a bit of a backlash after reaching number one with 'I Wish Was A Punk Rocker'. Did you find it hard to deal with the criticism?
"It was a bit hard because I wasn't used to the media at that point - let alone the meaner side of the media! It was all quite difficult dealing with the success of the single and then the backlash, but at the end of the day I just took my mother's advice and thought about the old saying, 'Tomorrow it will all be wrapping chips'. I just look back now at all the fun times - they totally overpower the negative stuff."
Do you view new female stars like Duffy and Adele as your competitors?
"We're entering a time now where gender isn't something we consider any more. We are all singer-songwriters whether we're a man or a woman. We're all in the same business and I always make the effort if I see anyone to go up to them and say hello. I met Amy MacDonald after her album had gone in the charts and I had a nice chat with her. There's a belief that it's all a bit bitchy, but it's not really like that. I think it's good for us all to be friends and egg each other on a bit."
Sandi Thom releases her new single 'The Devil's Beat' on May 19.