Political cartoonist Gerald Scarfe says he's tried to include most of Britain's most notable characters, from Charles Dickens to David Beckham.
His huge murals have been hung on the walls of the new 'Scarfes Bar' in the Rosewood London hotel in Holborn.
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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.