Preview

Gabby Logan looks ahead to the World Athletics Championships with Michael Johnson, Colin Jackson, Denise Lewis and Paula Radcliffe. Following on from the huge success of the 2012 Olympic Games, London is again the host city as the world's finest athletes gather for fierce competition on track and field.

The greatest sprinter of all time, Jamaica's Usain Bolt, is expected to make his final appearance at these championships as the eight-times Olympic champion and fastest man on the planet goes for yet more glory in the 100m and 4x100m relay. Other superstars on show include Britain's finest-ever distance runner Mo Farah, who attempts to add to his historic 'quad-double' in the 5,000m and 10,000m after winning both races at London 2012, the 2015 World Championships in Beijing and 2016 Rio Olympics.