Though the group, which also runs grocery stores, pharmacies and funeral parlors, will remain the largest single shareholder with a 30 percent stake in the bank, it was forced to take out full page advertisements in British newspapers to underscore its commitment to retaining its values.
The Mail on Sunday reported that Flowers, a Methodist minister, bought the drugs just days after a parliamentary committee grilled him on the bank's disastrous financial performance.
That committee session was memorable because Flowers, who quit as chairman after a little over three years as chairman in June, failed to answer very basic questions about his own bank. Flowers told Treasury Select Committee chair Andrew Tyrie that Co-op's total assets were about 3 billion pounds ($4.83 billion) they actually total about 47 billion ($75.7 billion).
At a time when the financial crisis already saw the public questioning the ethics of bankers, the testimony raised questions over their competence. Now critics are wondering whether regulators were doing enough to supervise and monitor a bank's most senior leaders and decision makers.
"This latest episode over the chairmanship of the Co-op illustrates how much there is to do to reform the regulatory approval process for bankers, especially those at the top of our banks, and how important it is that fundamental reform take place," Tyrie said in a statement.
Unlike people who manage investments, for example, there's no set qualification for a chairman. Knowledge of an organization and how it works is among the critical factors authorities examine, but many organizations seek out a board with a diversity of backgrounds and experience making any single test difficult to administer.
Flowers apologized for his behavior and said personal and profession pressures led him to do things "that were stupid and wrong."
West Yorkshire police are making inquiries and Flowers' problems continue to mount.
Bradford council said Flowers resigned as a councillor in 2011 after "inappropriate but not illegal adult content" was found on a computer he used.
The opposition Labour Party has suspended Flowers as did his church.