Yellow statues, designed to make people think about how they use Accident and Emergency services, have begun a tour across north London.
The figures each represent a different injury or illness - and are displayed alongside information on the best NHS services for treating that problem.
Doctors say many people wait for hours in A&E when they could have got quicker treatment closer to home.
More top news
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.