Will it be as spectacular as Beijing with its 2,008 drummers? Or as Los Angeles in 1984, when the Olympics opened with a man flying into the arena using a jet pack? Danny Boyle and his team have gone to extraordinary lengths to keep the content of next Friday’s Opening Ceremony secret. Volunteer performers each signed pledges that they would not reveal details to outsiders, and professional technicians and dancers are under contract not to disclose their roles. Mr Boyle, the Ceremony’s artistic director, sent everyone involved a personal email, and organisers have set up Facebook and Twitter groups urging everyone taking part to “Save The Surprise”.