The trial of two men charged with the murder of oil executive Carole Waugh, whose body was found with a single stab wound inside a car at a garage in south-west London in August 2012, is due to begin today.
Rakesh Bhayani, 40, and Nicholas Kutner, 47, are charged with murdering the 50-year-old, who disappeared from her central London home.
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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.