Labour leader Ed Miliband announced he has appointed former Labour general secretary and union official Lord (Ray) Collins of Highbury to lead work on the introduction of a new system, which will consider an open primary process for the London mayoral candidate selection.
Lord Collins will also consider how the proposals could be spread to other parts of the country.
- Under Mr Miliband's proposals, any Londoner registering as a Labour supporter will be eligible to vote in the ballot to choose a candidate to replace Boris Johnson in 2016.
- A new code of conduct will be drawn up to cover all applicants to be Labour parliamentary candidates.
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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.