Who Are These People?

Plot:

We are introduced to a range of characters across the globe who are leading their lives in their own unconnected way, right up to the point when the American President announces to the world that an extinction level event is due in 34 days time when an asteroid, 8 miles wide, will impact the earth. For some reason, all of these characters will come together in a bunker deep underground in a town in the UK called Slough to watch the end of the world on TV.