We look at the extraordinary events of the past week at Ireland's biggest stockbroker Davy, with help from reporter Joe Brennan and Professor Niamh Brennan, an expert on corporate governance.

Davy was fined €4.1 million for conducting a bond deal in which 16 of its own employees, including senior executives, were the buyers, a fact unbeknownst to the seller.

How could such a breach occur and what comes next for the company?