A new report from the London Assembly says more should have been done to speed up compensation payments for businesses hit by last years riots.
The report, Picking up the Pieces, argues that poor coordination and the Government's lack of urgency held back the recovery process.
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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.
A wet start to the week and the unsettled weather is set to continue over the next few days.