BREAKING: UK PM Sacks Finance Minister, Kwarteng Appoints Another | READ WHY

The chancellor of the exchequer was dismissed in person by Truss after he rushed back early from international meetings in Washington, multiple media reports said, and she was due later to hold her first Downing Street news conference.

Jeremy Hunt has now been appointed the new UK Prime Minister.

Financial upheaval sparked by the new government's September 23 plan to slash taxes - financed via billions in more borrowing - has subsided somewhat since the Bank of England intervened in bond markets.

But the central bank was adamant it would end its bond-buying spree on Friday, and market analysts said only a bigger climbdown by Truss following Kwarteng's disastrous budget announcement last month would avert fresh panic.

No timing was given for Truss's news conference, but the announcement underscored the sense of peril as some Conservative MPs reportedly mobilised to unseat the new leader just five weeks since she succeeded Boris Johnson.

Kwarteng was due to conclude annual meetings of the International Monetary Fund and World Bank in Washington this weekend, after earning a rebuke from IMF chief Kristalina Georgieva on the need for "coherent and consistent" policies.

A Treasury spokesman confirmed Kwarteng had cut short the trip "to continue work on his medium-term fiscal plan" due on October 31, after Truss held hurried meetings with her own financial advisors on Thursday in his absence.

As UK broadcasters showed live footage of Kwarteng's British Airways plane landing at Heathrow airport, government bond yields eased in a sign that markets did expect a volte-face.

Speculation was rife that Truss would row back on planned changes to corporation tax, having already changed her mind about cutting income tax for the highest earners.

The promised tax cuts were the centrepiece of Truss's successful pitch to Tory party members that she rather than rival Rishi Sunak was the best candidate to replace Johnson.

That programme now lies in tatters, and Truss's judgement is in question more than ever, after Sunak's warnings were entirely vindicated: higher borrowing to pay for tax cuts served only to terrify the markets and drive up borrowing costs for millions of Britons.

AFP