Young Ella Yelich-O'Connor hasn't done too badly for herself over the last couple of years. After revealing a deft talent for vocal acrobatics and opulent melodies with her early singles 'Tennis Court' and 'Royals', she made one of the smartest pop albums of recent times – her debut, 'Pure Heroine' – then wowed the audience at the Grammys. Now she's back in the UK for her first shows since a tiny one-off club gig last September. And she's still only 17. Props, Lorde.