The Prince's Trust is celebrating 30 years of helping London's young unemployed create their own businesses. The start-up programme was officially launched in 1983, 7 years after the Prince of Wales founded the trust.
Since then, it's helped thousands of men and women acquire the skills and the confidence to get working.
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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.