Welcome to the 40th Anniversary Swimathon! Friday 20th – Sunday 22nd March 2026.<br/>2026 marks 40 years of this iconic event — and we’re hugely grateful to be part of it! 💛 Swimathon has raised over £50 million for charities. In 2026, Swimathon is supporting: Cancer Research – Marie Curie – and Swimathon Foundation. Please support Cathy &, Anna to raise as much as possible this year.