More than half of Londoners think the capital should copy cities like New York indesigning its own logo, according to a new YouGov survey.
Londoners were also asked to decide which words most describeLondon, with 'diverse', 'creative' and 'proud' proving the most popular with residents.
Asked which sights most represent the city, traditional icons like Big Ben, Tower Bridge or the London Underground were the most common answers
Meanwhile, no respondents chose the Gherkin or the Olympic Stadium, both newer landmarks.
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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.