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Disabled athletes got under way under the watchful gaze of a giant inflatable dog.
The force was strong as a light-sabre bearing runner dressed as Darth Vader passed the University of Greenwich.
Virgin founder Richard Branson winged his way through London at the head of a giant caterpillar.
Making up one segment of the caterpillar was Princess Beatrice - the first member of the Royal Family to take part in the event.
A band of knights in shining armour joined the assortment of Teletubbies, leprechauns and human beer bottles taking part.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.