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With the London Olympics a year away, the worlds best swimmers are even more focused on reaching their peak. Clare Balding is joined by Mark Foster for coverage of the swimming programme at the World Aquatics Championships in Shanghai.

Four more world champions will be crowned, with American Michael Phelps looking to add to his unprecedented tally of gold medals when he defends his 200m butterfly title. Italy's most successful sportswoman, Federica Pellegrini, is also attempting a successful title defence, in the 200m freestyle.