Cassie Patten calls on Londoners to join Swim Serpentine event

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Cassie Patten calls on Londoners to join Swim Serpentine event

The former Olympic open-water swimmer Cassie Patten has been in Hyde Park to call on Londoners to join her in this year's Swim Serpentine event.

Organisers of the open-water festival say this year's race will be the biggest yet - with a drive to ecourage more women, and first time competitors.

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