The disclosure that it was Mr Adoboli's decision to inform his colleagues of his actions that set alarm bells ringing at UBS, rather than its own monitoring system, will add to concerns that investment banks simply aren't capable of controlling the huge risks that their traders take.

BBC: UBS did not notice Adoboli's ?1.3bn loss

He stopped at house after house on his ride, and, as part of a previously-arranged alarm system, town after town in eastern Massachusetts, upon hearing the news, began ringing bells.

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