Guest was hired to revamp the reputation of the company with corporate comms director Richard Emmott, who resigned two months ago (PRWeek, 13 August).
Head of external relations Phil Wilson Brown said Guest quit due to a decision to restructure her role following Emmott’s departure.
‘The head of internal comms will now report to human resources,’ he said.
The company is hunting a replacement for Guest, who said she left because the remit of her role had changed.
RSA has suffered negative press in recent months around its exposure to asbestos claims and annuities mis-selling.