Black cab drivers are to join a rally protesting against the sacking of workers at the London Taxi Company, which makes the vehicles.
The Coventry-based company went into administration last month.
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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.