Britain's former Prime Minister and newly appointed Foreign Secretary David Cameron walks outside 10 Downing Street in London, Britain, November 13, 2023. (Photo: Reuters)

Cameron, 57, served as British prime minister from 2010 to 2016, resigning after the outcome of the Brexit referendum, when Britain voted to leave the European Union.

His unexpected return to the front-line of British politics comes after he spent the last seven years writing his memoirs and involving himself in business, including Greensill Capital, a finance firm which later collapsed.