Very disappointed when I found out the long takes are faked and spliced.
For anyone who doesn't know already (yeah I know, I'm several years late on this), don't tell people it was all one take. It's not.
From the wiki:
Visual effects supervisor Frazer Churchill explains that the effects team had to "combine several takes to create impossibly long shots", where their job was to "create the illusion of a continuous camera move."
Once the team was able to create a "seamless blend", they would move on to the next shot.
the car ambush was shot in "six sections and at four different locations over one week and required five seamless digital transitions"; and the battlefield scene "was captured in five separate takes over two locations"
http://en.wikipedia.org/wiki/Children_of_Men#Single-shot_sequences
From wiki's source:
http://www.awn.com/articles/production/ichildren-meni-invisible-vfx-future-decay
we had to combine several takes to create impossibly long shots
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