Not entirely true. The reason Britain was hit so badly by the credit crunch (much more so than say Germany or France) is that since the 1980's (Thatcher, basically) we pretty much dismantled our manufacturing industry and built our economy around 'invisible' industries - basically service industries and finance. That meant that when the finance sector went belly up, we were much more badly affected than those countries with a more diversified economy.
So, to put it bluntly, if a chunk of the finance sector DID f*** off somewhere else, forcing our economy to become more diversified as a consequence, we might actually be more insulated from the damage the next time the bunch of chinless idiots decide to be the farm on a fool's premise. basically, we'd be passing a chunk off the risk off to someone else.
Because, sadly, you're not allowed to kill them.
Jon