20-year-old Florence Welch has her roots in the rough and ragged sound of American pre-war folk and blues. The skinny, freckle-faced redhead in the floral shirt tied to the waist is the centre of attention as she pounds the floor with her foot and fills the room with her powerfully simple, stripped-back, rocked-up folk'n'blues, with a scintilla of guitar and smidgeon of drums. Echoing the kooky stagecraft of Kate Bush, feisty growl of Janis Joplin and pastoral menace of Sandy Denny