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The war in Iran has sent shockwaves through the UK economy, causing gilt yields to surge to their highest levels since the 2008 global financial crisis. This increase in borrowing costs has significant implications for Chancellor Rachel Reeves' fiscal policy, potentially eroding the £23bn in 'headroom' she had built up against her fiscal rules.Reeves had hoped that this cushion would allow her to focus on tackling inflation and stimulating growth, but with oil prices up 50% since the onset of the war, investors are now expecting higher inflation and interest rates. As a result, the government's cost of borrowing is set to rise, impacting its ability to fund public spending.The yield on 10-year gilts has jumped to nearly 5%, pushing up the cost of borrowing and forcing Reeves to reconsider her spending plans. This development has also raised concerns about the UK's economic fragility and the potential for a Labour leadership contest to be triggered after the May local elections.Economists warn that the chancellor has probably already lost a third to half of her headroom due to the combination of higher inflation, weaker employment, and surging gilt yields. The situation is further complicated by the UK's high debt levels and reliance on global markets, leaving little room for maneuver for any future government.The implications of this crisis extend beyond Reeves, raising questions about the economic pitch of any potential steward of the economy, whether from Labour or other parties. As Angela Rayner considers John Healey as a potential chancellor, the need for a carefully plotted economic policy that balances growth and fiscal responsibility has become increasingly urgent.

The UK government's borrowing costs have risen above 5% amid an intensifying global bond market sell-off fueled by the Iran war. The yield – or interest rate – on 10-year debt hit its highest level since the 2008 financial crisis, rising 13 basis points to 5.081%, as investors acted on concerns about the economic fallout from the conflict.Borrowing costs also rose for the US and eurozone governments, underscoring growing turbulence in the global financial system after Donald Trump's extension of a deadline for a peace deal failed to soothe jittery investors. Financial markets worldwide slumped on Friday, extending falls seen since the outbreak of the war, with losses in London and across major US and EU trading hubs. The price of Brent crude remained above $110 a barrel.Kathleen Brooks, the research director for the UK at the financial trading platform XTB, said: “Markets feel more panicky this week, and Friday’s price action suggests that investors are losing faith in Donald Trump’s ability to end this war and reach a deal with the Iranians.”Economists have warned that the Bank of England could be forced to take a tough approach to tackling inflation after losing some of its credibility by underestimating the leap in inflationary pressures in 2022. The increase in borrowing costs will add to the challenges facing Rachel Reeves, the chancellor, amid pressure on Labour to provide a package of financial support for households already reeling from a cost of living crisis.