It was simply a PR stunt for a special effects company. We have seen this strategy used before and its an effective one - post a video let it go viral - I mean why not? it show's off their work and is major free publicity.
The footage was filmed near the BBC Radio 1 building in Great Portland Street, and shows specks of white light flying at high altitude over the capital.
The footage is believed to have been shot from inside the offices of a visual effects company called The Mill. The firm creates special effects for the film industry. enough said - Period!