For only the second time in 800 years, the City of London welcomes a woman to the office of lord mayor. In the world's largest unrehearsed parade, the streets of London will be the stage for 21 bands, 150 horses, countless vintage cars, helicopters, robots, unicycles, dancers, beds, bathtubs, and one camel - not to mention half a million spectators.

Chris Hollins and Helen Skelton meet some of the procession's 7,000 participants as London celebrates the arrival of its 686th lord mayor. With commentary by Paul Dickenson.