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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.
During the Olympics, 8,000 Team London volunteers were deployed across the city, in major transport hubs and tourist hotspots, to welcome visitors to London.
Now, Boris Johnson hopes to build on the success of that programme, by using volunteers "as an additional resource for large scale events".
Today, the first pilot scheme begins at St Pancras Station, with Team London Ambassadors providing a warm welcome to international visitors arriving on the Eurostar.
This will be followed by a series of other projects, which will see ambassadors:
helping tourists arriving at events at the 02 arena in Greenwich.
welcoming visitors during busy periods at Gatwick Airport.
selling poppies to raise money for the Royal British Legion.
at Saracens Rugby Club home games when the team returns to London in the New Year.
The Mayor's Senior Advisor for Volunteering, Charities and Sponsorship, Veronica Wadley, said:
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.
Olympic Ambassadors will be back on the streets of London today. Volunteers will be in "pods" at St Pancras International Station to welcome tourists arriving on the Eurostar.
It's the first of a series of pilots to test the project. There are 55 volunteers taking part.
Latest ITV News reports
Team London Ambassadors - the volunteers who helped make the London Olympics such a success - have returned to the capital.