OK, so the cost of the crash world-wide is £2.8 trillion. These numbers only make sense to physicists and economists, so the Guardian has helpfully converted it to "buying 13,000 lattes for each person in the UK", amongst other examples.
Updated to say that the BBC's voice of doom ( Robert Peston) was putting this at £5trillion at lunchtime and not a mention of infinite improbability factors!
http://www.guardian.co.uk/business/2008/oct/28/economics-credit-crunch-bank-england You could read the story above...( Doom)
OR
You could watch this: ( Cheery)
http://www.guardian.co.uk/world/video/2008/oct/27/australia-dog-fire-rescue It brought a tear to my jaded eye.