Just seen this. If you get a chance, try to see it. Filmed on the 12th November 2011 - the day after Remembrance Day - it is a tour de force of editing of the output of countless videographers and their cammies. Very funny, moving, scary, beautiful, poignant, touching...
Found the BBC iPlayer page, but got this message in Canada: "Currently BBC iPlayer TV programmes are available to play in the UK only...".
Did a quick search but didn't find a link that would work in North America. YouTube hits look like individual contributers or ads. Anyone find non-UK access?