Some of London's leading environmentalists are proving just how important keeping the city green is to them by taking part in a four day cycling extravaganza.
Amateur cyclists chosen from environmental teams from the likes of the Mayor's office and local councils are coming together riding from York to London. Raising money for charity along the way. They have the backing of Boris Johnson and Peter Daw from The London Green Cycling Club who organised the event. He spoke about how it all started.