Impact of the Iran Conflict on UK Government Borrowing Costs

UK government borrowing costs have surged above 5%, reaching levels not seen since the 2008 financial crisis. The yield on 10-year gilts, which reflects the interest rate investors demand to hold UK government debt, increased to 5.081% as of late March 2026. This spike is attributed to a global bond market sell-off triggered by the ongoing conflict between the US and Israel against Iran, which has raised concerns about economic fallout, particularly in the UK. The price of Brent crude oil has also remained elevated, exceeding $110 per barrel, further exacerbating inflation fears.

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The conflict's impact on the UK economy is significant, as it is heavily reliant on global trade and sensitive to fluctuations in energy prices. Economists warn that the UK could face more severe economic repercussions than other industrialized nations due to its dependence on imported gas and the potential for inflation to become entrenched. As a result, financial markets are anticipating that the Bank of England may need to raise interest rates more aggressively than its counterparts in the US and eurozone to combat rising inflation.

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The sell-off in UK gilts has been sharper than in any other G7 economy, with yields rising more than 80 basis points since the onset of the conflict. This trend raises concerns about the government's ability to meet its fiscal targets, particularly as the Office for Budget Responsibility had projected significant expenditures for debt servicing in the coming years. In contrast, yields on 10-year bonds from Germany, the US, and France have risen by 42, 48, and 64 basis points, respectively, indicating a more stable bond market in those countries.

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Market analysts attribute the heightened demand for a premium on UK bonds to several factors, including the Bank of England's already high policy rate and the UK's higher inflation rate compared to its peers. Additionally, political uncertainties, particularly regarding the Labour Party's performance in upcoming local elections, have contributed to investor apprehension.

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Experts from the National Institute of Economic and Social Research have indicated that the Bank of England's monetary policy committee (MPC) may need to adopt a tighter interest rate path to restore credibility amid rising inflation. Former deputy governor Charlie Bean noted that while the MPC's decision to maintain the interest rate at 3.75% was appropriate given the uncertainties, the Bank's reputation could compel it to act more cautiously in the future.

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Critics argue that the Bank of England's previous handling of inflation, particularly during the Covid pandemic and the Ukraine conflict, has undermined its credibility. Some economists contend that a more aggressive increase in borrowing costs may not effectively mitigate the energy price shock and could instead push the UK into a deeper recession.

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There is a divergence in expert opinions regarding the potential for the Bank of England to "look through" the current energy price surge. While some believe that the central bank should remain vigilant and act promptly, others caution that the economic context is markedly weaker than in 2022, with slower growth and rising unemployment.

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“Overall, the panel favoured a tighter interest rate path in the UK, with credibility being cited as a contributing concern,” — National Institute of Economic and Social Research

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“As there is a perception that the Bank was a little tardy in tightening policy back in 2022-23, it is important that MPC are vigilant and act promptly if needed this time around in order to reinforce the committee’s credibility,” — Charlie Bean, Former Deputy Governor of the Bank of England

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