Easter Eggs in London

Wonder how the big Easter Egg hunt is working in London?  The ones above are outside Green Park tube station and a poster in a window along Pall Mall. Seems there are 200 eggs to be found over a 200 day period (so not just Easter then). Saw some tourists taking pictures alongside the Faberge egg above. But personally think it's a campaign that is too large and spread over too many days. But at least there is an event attached to it. A few years back there were small elephants that appeared in Amsterdam, but no way of finding out what all that was about.

Actually all the eggs are currently in one place. All this week and over Easter, they're all in the Covent Garden Piazza.