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In emails seen by the BBC, ConvrtX's compliance officer told Mr Marshall that if he publicly shared his "baseless allegations" it would be "criminal and civil libel" and the company would seek a "criminal charge" against him.

The compliance officer also said that Mr Marshall had "signed away" his right to post negative reviews online about ConvrtX because of a non-disclosure agreement signed prior to the work starting.

The compliance officer Paolo Basarri, who looked into the allegations that Ben Sulayem interfered in the operations of two races during the 2023 season, was fired in November.

Mayer was one of four figures to depart in two weeks last autumn, in addition to the deputy Formula 2 race director Janette Tan, the F1 race director Niels Wittich and FIA compliance officer Paolo Basarri.

The compliance officer Paolo Basarri, who looked into the allegations and reported them to the ethics committee, was fired last month.