John Humphrys talks to high-fliers who have experienced turbulent times. 2: Zola Budd on the loneliness and despair of the long-distance runner. The 17-year-old barefoot running prodigy was assaulted by anti-apartheid protesters and blamed for tripping Mary Decker in the final of the 3,000-metres race at the 1984 Los Angeles Olympics. Producer Brian King Repeated at 9.30pm