First a protester was ejected from the budget meeting, then Boris himself. Now the planned closures of fire stations and police station front counters look set to happen. Our Political Correspondent Simon Harris recaps on the morning's events at City Hall.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.