As the Tory leadership election highlights questions of social mobility, David Goodhart looks at why some people seem to have more luck than others. To what extent can we create our own opportunities, regardless of background? What role does personality play? And is it really possible to engineer and cultivate our own luck by being open to chance encounters?

Producer: Adele Armstrong
Sound: Peter Bosher
Production coordinator: Gemma Ashman
Editor: Richard Fenton-Smith