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Mark Giles, principal at The Hathershaw College in Oldham, said the app was "accurate and verifiable" after conducting a local trial at his school since last spring.

"The water industry fails, fails and fails again," said Giles Bristow, CEO of Surfers Against Sewage.

"This threat is asserted and not proven, and these companies are profit-driven so it is not in their interests to sabotage our infrastructure," said Prof Giles Mohan of the Open University.

Henry Patten and Finnish partner Harri Heliovaara also reached the semi-finals in Monaco, losing to the eventual champions, while Giles Hussey triumphed at the ITF M15 in Monastir.

Dent’s coach at Centennial, Josh Giles, said Dent would have been more widely recruited out of high school had he not begun to blossom at a time when on-campus recruiting was limited because of the COVID-19 pandemic.