In his trilogy of documentaries the filmmaker Asif Kapadia rejected the traditional tools of the trade. Instead, he painstakingly reconstructed the lives of Formula One champion Ayrton Senna, acclaimed singer Amy Winehouse and legendary footballer Diego Maradona almost entirely from archival footage. Anne McElvoy asks Kapadia whether this forensic approach reaches closer to the real person behind the myth. They talk about the difficulty of interviewing a champion of deceit and whether it matters if the hero of the story is sometimes a villain. Also, what does it take to be the greatest footballer of all time? And at what cost?