He also misled both Barclays and the FCA by providing an account of events that was untruthful.
The FCA said the bank should have placed more importance on this, particularly as it was reviewing its procedures as a result of the Libor fine.
After the FCA took action to secure compensation for the affected customers, the matter was referred to the City of London police to see if the firm should face a criminal investigation for fraud.
The Financial Conduct Authority (FCA) prosecuted Hopeafter he ran a scam in which he claimed to be making large returns for investors from the profits of his foreign exchange trading.
Hope and Von Badlo will be sentenced on 16 January and the FCA said it will instigate confiscation proceedings against both defendants.
There is a reminder for consumers here that unauthorised investment schemes are often incredibly risky and if the promised investment returns seem too good to be true they most probably are," said Georgina Philippou, acting director of enforcement and market oversight at the FCA.
Barclays, which is contesting the allegations, cites a "formal warning" notice from the FCA which has warned the bank that it "acted recklessly" in the way it disclosed the information about the fees and in so doing breached some of the rules governing the way shares are listed on the stock exchange.
The Barclays customer complained, and the FCA said Plunkett – who was paid £284,000 in a year – failed to disclose that he had placed orders and traded during the gold fix.
According to the new information provided by Barclays, the FCA has concluded that the bank should have disclosed more details about the fees due to Qatar Holdings, which amounted to £322m over five years.
November 2013: George Osborne announces that the FCA will put into place a cost cap on lenders.
Jenkins took the helm at Barclays in September 2012, and the FCA found that bank did not have any systems in place to record orders by traders during the gold fix until February 2013.
