Plans to build a branch of the high speed rail link to Heathrow have been put on hold pending a review of future airport capacity.
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London is among the worst cities in the world for congestion, according to a new study.
Drivers on London's Night Tube are to vote on strikes in a long-running row over pay and jobs.
The mayor hinted that certain cars could be entirely banned from London's streets in an effort to combat the city's "toxic" air.