"The Royal College of Nurses sadly I don't think speak for their members because the picture they paint is not the picture that I see of the NHS. It is under pressure but actually the number of clinical staff throughout the NHS has gone up."
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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.