The Financial Reporting Council (FRC) met last week to consider the outcome of preliminary enquiries.
The body said on Thursday that its conduct committee had “made a decision which following certain procedures will be announced as soon as possible”.
And Sky News first reported on Sunday evening that the verdict would be announced on Monday. The FRC declined to comment.
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Last December, Treasury Select Committee chairman Andrew Tyrie called for a probe, saying: “The shortcomings of the audit process were serious. It is essential – in the interests of public confidence – that the FRC get on with this investigation, and without delay.”