London Marathon

The provided articles do not contain information about the London Marathon. One article discusses a new organizer challenging the existing one for the Frankfurt Marathon, Germany's second-largest race. This is newsworthy as it signals potential changes in the organization and direction of a major running event. The other article describes a project using festival-goers' urine to create fertilizer for tree restoration in Brecon Beacons. Neither article relates to the London Marathon, so it's impossible to provide a summary about it based on the given information. The Frankfurt Marathon news is relevant to the running community in Germany, while the fertilizer project highlights sustainable practices.