Boris Johnson wants the power to tax and spend like Scotland and Wales.
He's also asking the government to let the capital keep more of the money it raises -- rather than share it with the rest of the country.
He says the current system is "simply not fit for purpose" given London's size and stature.Our Political Correspondent Simon Harris reports
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A few very isolated afternoon showers are possible with a maximum temperature of 22C.
Sadiq Khan argues people living in the capital should not be embarrassed about saying "first dibs for Londoners" when it comes to housing.