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This was passed to internal audit, which reviewed the allegations and concluded that they were substantiated and there appeared to be evidence of wrongdoing by Reeves and her two colleagues, according to a senior source with direct knowledge of the investigation.

The bank's internal audit department carried out the initial investigation and found there was evidence expenses rules appeared to have been broken, a senior source said.

But the initial part of the investigation, which was conducted by Internal Audit at the request of the bank's risk department, found that the three managers appeared to have broken the rules and the whistleblower's allegations were substantiated, according to a senior source with knowledge of the investigation.

The report was passed to the bank's risk department and, at their request, was taken on by the Internal Audit department.

The Internal Audit department, which had access to expenses claims and sign-offs, then assessed the complaint and supporting documents, according to two sources.