Yesterday afternoon Brian McKiernan issued an update to staff after Davy, the stockbroking firm he leads, was fined €4.13 million by the Central Bank over an extraordinary Anglo bond transaction. In an embarrassing twist, McKiernan, who had sought to personally profit from the transaction, was last night forced to reissue the staff update amid fears that his initial commentary breached the terms of the settlement with the regulator.   The National Treasury Management Agency, which deals extensively with Davy, meanwhile has issued a statement in response to the affair. “The NTMA notes the very serious findings by the Central Bank…