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Barry, if Brown, also known as Gordon on official documents, introduced something really silly, as you suggest, then many top bankers must have done a very silly thing by taking advantage of it.
They would have been wise to inform Mr G. Brown, even the larger cabinet, the Parliament, and the local press if need be, of any blatantly wrong regulation introduced by the said G. Brown, if they were not so silly, that is, rather than foolishly taking advantage of it and sending half the world banking system K.O.
Still, Barry, Mr. Brown's regulations might explain why bankers in the UK did silly things, but that still doesn't expkain why banks in so many other countries went bankrupt at the same time as many British banks did in 2008.
Surely, the saga goes beyond the sole G. Brown! He can't be solely responsible for what top bankers did.