Last week (ends29Mar15), BBC Director-General Tony Hall announced that Clarkson's contract with the corporation will not be renewed after the presenter became embroiled in a bust-up with Top Gear producer Oisin Tymon over catering arrangements.

However, fans of the motoring show have not taken the news lightly, and the Metropolitan Police are now conducting an investigation into reported death threats made to Hall shortly after he announced Clarkson's departure.

A spokesperson for the police says, "Police in Westminster are investigating an allegation of threats to kill. The allegation was reported to police on Wednesday, 25 March. The threat was made by email."

A police representative also tells CNN that "the content of the message suggests it was sent from outside the U.K."

Clarkson, who has hosted the network's most successful programme since 1988, has received an outpouring of support since the controversy, from figures including actor Russell Crowe, Britain's Prime Minister David Cameron and rapper Snoop Dogg.