Stephen Sackur speaks to Petula Clark, a much loved child performer during World War Two. Getting to the top in show business is hard - staying there is much, much harder. Few stars can match the sustained success in music, film and theatre as her. She went on to have a host of hits in the UK, France, the US and pretty much everywhere else. She has worked with legendary names from Fred Astaire to Serge Gainsbourg, and she is still singing and touring. So what makes her tick?

(Photo: Petula Clark performs at the Songwriters Hall of Fame 44th Annual Induction and Awards Dinner, New York Marriott Marquis, 2013. Credit: Theo Wargo/Getty Images)