An onlooker from the set wrote the following on Twitter,
Walked past eight hearses with flag draped coffins at the Chapel at the Old Royal Naval College. The funeral scene for the new James Bond.
The website
Footprints of London say the following,
Eight coffins draped in union jack flags and arranged in two neat rows occupied the vaulted ceilinged room which normally houses the elegant tables and chairs of the King William Undercroft restaurant.
They also say that Judi Dench was spotted on set, and I quote their own words,
surveying the gruesome aftermath of a mass assassination of her agents.. Thankfully, Daniel Craig was not seen on set (although extremely predictable).
Skyfall is released on October 26 and stars Daniel Craig, Javier Bardem, Ralph Fiennes, Judi Dench and Ben Witshaw