Welcome to the London Olympics, 2012. Let the Games Begin!
(also at: http://www.youtube.com/watch?v=zEDFMKjhLRw)
Though I was hoping it was an in-house job, I stand now corrected --
it's crafty editing by someone known as cassetteboy.
I'd prefer it be the "Official Welcome" but we'll take it nonetheless -- it fits the man starring in it.
See it here!