Day 8, Part 1

Jonathan Edwards presents live athletics coverage from Beijing, China, including the heats of the men's and women's 4x100m and 4x400m relays.

At the last World Championships, held in Moscow in 2013, Britain's female relay runners claimed memorable bronze medals in both the 4x100m and 4x400m finals - which were won by Jamaica and Russia respectively. But it was a different story for the British men, who were stripped of bronze in the 4x100m because of an illegal changeover before ending fourth in the 4x400m.