The Met is planning to buy three second hand water cannon from German police at an estimated cost of £200,000.
Speaking this morning, Boris Johnson said: "I have concluded there is broad support amongst Londoners for the use of this measure by the police in limited circumstances."
The majority of the 25 Assembly members - including Conservatives - are opposed to water cannon.
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The average increase across the capital is 9.2% this year - with areas in the east and south of the city up by 15-16%.
The University of South Wales opened a centre in the Docklands in London, but has attracted no students and has been forced to close.
Mark Howell had his membership cancelled after a women who rented one of his rooms gave him a massage, according to reports.