Contractors have started work to dismantle the Olympic Equestrian arena at Greenwich Park.
But local people have questioned why the work to restore the park has taken so long.
But the London Olympic Committee says it is on track to hand back control of the area to The Royal Parks next month.
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New research shows almost half of Londoners currently own their own business, or plan to do so.
David Cameron said the Met proved it can "do more with less" and declined to criticise the Mayor of London for his water cannon spend.
A group of disabled activists threw toys and balls at him as he entered the conference.