This fine series of Olympics documentaries is really getting us in the mood for Rio, with the latest looking at the notorious 3,000m final at the 1984 Games in Los Angeles – and the contrasting stories of the main protagonists. Zola Budd’s Olympic participation was already shrouded in controversy because of the South Africa-born teenager’s fast-track British passport. But when the 18-year-old barefoot runner clashed legs with America’s track and field sweetheart Mary Decker, sending the latter crashing to the track, the fallout would define their careers. Both athletes tell their story in a film charting what happens when the worlds of sport, media and politics collide…