UK braced for £35bn hit and possible recession as Iran war drags economy into slower growth, thinktank notes

The National Institute of Economic and Social Research, a well‑known British think‑tank, has projected that the United Kingdom will absorb a direct economic shock of approximately £35 billion as a consequence of the ongoing war in Iran, thereby adding a substantial new strain to the fiscal challenges already confronting the administration of Prime Minister Keir Starmer. According to the institute’s most optimistic scenario, the macro‑economic outlook for 2026 and 2027 remains markedly subdued, with growth rates expected to lag significantly behind the pre‑conflict trajectory, a circumstance that not only intensifies the probability of a recession within the current year but also underscores the limited capacity of existing policy tools to offset external geopolitical disturbances.

The warning arrives at a time when the Starmer government, already navigating the twin pressures of post‑pandemic recovery and an inflated public debt burden, finds its credibility further eroded by an external shock that it cannot directly influence, thereby exposing a chronic reliance on optimistic forecasts to sustain political stability. In practice, the institute’s model assumes that supply‑chain disruptions, energy price volatility, and heightened risk premiums stemming from the Middle East conflict will translate into reduced investment and consumer confidence, a set of assumptions that, while plausible, also reflect a tacit acknowledgement of the government’s limited capacity to shield the economy from spill‑over effects beyond its immediate jurisdiction.

Taken together, the forecast underscores a broader systemic vulnerability wherein the United Kingdom’s macro‑economic resilience is increasingly contingent upon external geopolitical stability, a reality that renders contemporary policy frameworks, which remain heavily predicated on domestic levers, insufficiently equipped to anticipate or mitigate the fiscal ramifications of distant conflicts that nevertheless reverberate through global markets. Consequently, the implied message for policymakers is that without a recalibration of strategic economic planning to incorporate the inevitability of such international disturbances, the nation may well find itself repeatedly confronting ad‑hoc fiscal patches that merely postpone, rather than resolve, the underlying susceptibility to recessionary downturns.

Published: April 29, 2026