Here is the egg in situ in St Martins courtyard, just off Mercer St nr Covent Garden in London.
If you can hunt down all 209 eggs then you could stand to win a £100,000 Jubilee Faberge egg.
Just think what you could do with that! Among the contributing artists you will find, the Chapman Bros, Andrew Logan, Zaha Hadid, Zandra Rhodes, Sir Peter Blake, Sir Ridley Scott to name but a few. Happy hunting