The Mayor's Senior Advisor for Volunteering, Charities and Sponsorship, Veronica Wadley, said:
"2012 has been an extraordinary year for London and the achievement of hosting the Games has shown what a terrific welcome we can give visitors. With the help of the Team London Ambassadors and other volunteering programmes, we want to build on the city's reputation for being able to deliver the most fantastic place in the world to visit."
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More than a tenth of the Piccadilly Line train fleet is out of action because of emergency repairs to damaged wheels.
Rows of students stood and turned their backs before filing out of the lecture theatre.
Effie the endangered Western lowland gorilla has given birth to a healthy baby boy at London Zoo.