London Winter Run 10k 2025. The cancer research uk london winter run is a ten kilometre challenge through the heart of the capital. After unprecedented demand, the 2025 cancer research uk london winter run is now at full capacity, as an incredible 25,000 people gear up to conquer the cold at the 10th anniversary.
It is the uk’s largest 10k with over 20,000 taking part annually. You can expect many of your favourite features and creatures to.