PARIS, FRANCE – AUGUST 09: Toby Robinson of Team Great Britain competes in the Marathon Swimming Men’s 10k on day fourteen of the Olympic Games Paris 2024 at Pont Alexandre III on August 09, 2024 in Paris, France. (Photo by Luke Hales/Getty Images)

Olympic-level swimmers are set to navigate the length of the Thames next week in a bid to highlight calls for better protection from pollution of the UK’s waterways, lakes and seas.

Eight elite swimmers are taking part in the non-stop relay, which will begin at the source of the Thames in Gloucestershire on Monday and culminate in Teddington on Thursday, when they will paddle to Westminster to voice their concerns to MPs.

It is being organised by campaign group Surfers Against Sewage, which says that the water industry is in need of a drastic

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