Boris Johnson has volunteered to be blasted by a water cannon. The Mayor of London was challenged over their safety, and replied: "Man or mouse. You’ve challenged me, so I suppose I’m going to have to do it now."
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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.