Conservatives on the London Assembly are investigating ways to put a freeze on rising tube fares.
Amongst other ideas, they have come up a plan to allow tube stations to be sponsored.
Could we soon be seeing Brand Beckham at Victoria, and Russell Hobbs at Russell Square? Tom Barton has been to investigate.
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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.