Team London Ambassadors - the volunteers who helped make the London 2012 Olympics such a success - staged a flash mob dance in St Pancras station today.
It's the first time the volunteers have returned since the end of the Games - but the Mayor of London is hoping it won't be the last.
Boris Johnson is planning to harness the volunteer manpower in a long-term programme, with initial pilots taking place over the next two weeks.
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Transport for London is not happy that its branding has been used.
If you've been anywhere near Trafalgar Square today you'll notice something different.
Look closely at this collection of images by photographer Jim Grover and you'll notice there's something missing.