Peter Hendy, the Transport for London Commissioner, has said Crossrail 2 is needed because London's population is growing by "a tube train a week".
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Joshua beat the older, more experienced boxer in front of 90,000 fans in Wembley Stadium.
The prince attended the rugby match in his role as patron of the Invictus Games Foundation, the official charity for this year's game.
A police officer who spent six days crawling the London Marathon in a gorilla costume has finally completed the 26-mile route.