From Wandsworth to Camden, hundreds of people have set to work in their local communities to mark Make A Difference Day.
Many have been inspired by the example set by London's 70-thousand Olympic Gamesmakers.
Piers Hopkirk has the story.
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Five activists were arrested after staging a three-hour demonstration which forced the closure of a tunnel at Heathrow Airport.
Those vying to be named the new Met Police Commissioner will speak to the Home Secretary, London Mayor and Policing Minister.
Monday's temperature was recorded at Kew Gardens, west London, where visitors enjoyed temperatures 10 degrees warmer than Milan at 8C.