Fight, fight, fight!

As I've always maintained- the comments are the best part of this blog and a good fight is breaking out on the 'Benefits' post.

Can anyone actually explain in simple terms and without referring to some other article (which may or may not be true) just how much the banking crisis actually cost us? I've seen figures in the press ranging from zero to a trillion pounds, which I can't help but think is a rather generous margin of error.