John Inverdale presents live coverage from the Alexander Stadium in Birmingham where Britain's top athletes are battling it out for national titles and a chance to book their spot in the team for the World Championships, which take place at the end of next month in Daegu in South Korea. Today's events include the men's and women's 100m semis and finals.

Joining John are Michael Johnson, Colin Jackson and Denise Lewis. Commentary comes from Steve Cram, Paul Dickenson and Jonathan Edwards. Show less