London Winter Run 2025 Start Time. The winter downs 200 is a 200 mile continuous trail run. The cancer research uk london winter run is a 10k challenge through the heart of the city, passing world famous landmarks, and instantly recognisable areas that have been taken over by winter creatures.

Right now, our london winter run supporters are getting ready to run 10k through the streets of london to raise vital funds for research into preventing, diagnosing, and treating cancer. When is the 2025 london winter run?