Sigrid: I've never had this much fun recording an album before

Getty ImagesSigrid says her single Fort Knox is "one of my favourites that I've ever made"You might be surprised to hear an artist who's performed on some of the biggest festival stages in the world describe themselves as an introvert.But popstar Sigrid insists that's what she is.The Norwegian singer-songwriter first burst on to the scene as a teenager.By the time she was 21, she'd performed at Glastonbury,…