Heart Breakfast chats to David Walliams
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David Walliams donned his wetsuit in bid to swim 140miles of the Thames, starting from Lechlade in Gloucestershire!
After his Channel crossing last year this was his biggest sporting challenge yet – swimming a 225km (140-mile) stretch of the Thames for charity!
Warren spoke to David just before he got in the water to warn him about what he might encounter in the water..!