Matt Bowles has posted the London Calling 2014 Worldcon bid launch video. Steve Cooper, a bid co-chair, said he expects it will get taken down before long so enjoy it while you can. It was still available when I posted.
The video is a montage of London being destroyed in sf movies and tv shows. The choice of visual references and the manner in which they have been edited is touched with genius. I especially liked how The Prisoner’s Patrick McGoohan and Angelo Muscat appeared to be fleeing across a London boulevard to escape the alien army shown in the preceding clip.