A group of 140 senior doctors have written to David Cameron expressing concern over plans to close several accident and emergency units in west London.
In an open letter, the doctors said they have yet to see evidence that plans to centralise and downgrade A&E services are beneficial to patients.
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Mr Khan said the image of an Asian woman on a see-saw with an aggressive finger-jabbing white skinhead reinforced stereotypes.
The Central Line's from Essex, the Bakerloo Line is beginning to show its age and the Piccadilly Line is tourist glad to be in London.
The bitter war of words goes from bad to worse.