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Two Retina UK runners celebrating after finishing the TCS London Marathon.

Take on a challenge

With your challenge, you’ll help support people affected by inherited sight loss to lead better lives today and accelerate the search for treatments for the future.

Runners participating in The Big Half as they cross Tower Bridge

The Big Half 2024 – London

The Big Half is back for 2024! The vibrant, inclusive half marathon with a fun, festival atmosphere sees thousands of runners take on the 13.1 mile course through London, from Tower Bridge to the iconic Cutty Sark in Greenwich.