Starting on Shrove Tuesday - 21 February - the worlds biggest Easter egg hunt will take place in London to raise money for charities Action for Children, which delivers services that respond to the local needs of children and young people, and Elephant Family, the world's leading Asian elephant conservation charity - best known for Elephant Parade London 2010, which saw a herd of 260 brightly painted elephants push their way into London life when they took up residence in neighbourhoods and landmarks over the capital.