Three men have been jailed for a combined 33 years for being involved in the supply of firearms to gangs in south London.
Hume Bent, 47, Carlos Moncrieffe, 47, and Christopher McKenzie, 26, were sentenced at Croydon Crown Court for conspiracy to supply firearms and ammunition.
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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.