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27th April 2025 - London Marathon

27th April 2025 - London Marathon The London Marathon taking place on Sunday 27th April will necessitate road closures and diversions. The run starts south of the river in Greenwich, going over Tower Bridge, along the Embankment, through Parliament Square, Victoria and finishing at the Mall in front of Buckingham Palace. Roads along the route will not be open to traffic between 4.00am until 8.30pm.