Video: St Pancras flash mob

London's Olympic Ambassadors are back on the streets in a pilot project at St Pancras Station.

The volunteer force will offer advice to visitors on how to get to attractions, restaurants and shopping areas.

But, as Rags Martel reports, they started with something a bit more dramatic.

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Olympic volunteers return

Team London Ambassadors, who volunteered throughout the Olympics, have returned to the streets of the capital today.