The Straits of Hormuz, that narrow throat through which 20% of the world's oil passes, is once again the scene of a strategic crisis. Reports from the Gulf indicate that Royal Navy sailors are reaching the limits of endurance, rotating through extended patrols as Iran’s Islamic Revolutionary Guard Corps continues its provocative harassment of commercial vessels. The blockade, though not officially declared, has become a de facto reality: tankers face delays, insurance premiums have soared, and the cost of shipping crude has become a speculative affair. This is not merely a geopolitical irritant; it is a direct tax on global commerce, and the burden is increasingly falling on the British taxpayer.
Let us be clear about the numbers. Gilt yields, that barometer of fiscal credibility, have edged higher in recent weeks as the market prices in the risk of supply disruption. A sustained closure of Hormuz would push Brent crude above $100 a barrel, reigniting inflation just as the Bank of England is trying to convince us that price pressures are abating. The hawks on the Monetary Policy Committee will have to reconsider their dovish stance, and that means higher interest rates for longer. The effect on consumer spending, already squeezed by energy bills, would be immediate. This is a textbook example of how geopolitical risk translates into economic pain, bypassing the usual channels of fiscal policy.
The Royal Navy, stretched thin by years of budget cuts and a focus on carrier strike groups, is now being asked to perform the unglamorous but essential task of convoy escort. The Type 45 destroyers and Type 23 frigates on station are among the most capable in the world, but they cannot be in two places at once. The recent deployment of HMS Diamond and HMS Lancaster has provided some reassurance, but the tempo of operations is unsustainable. Sailors are reporting fatigue, with extended deployments taking a toll on morale and retention. The Treasury must ask itself: what is the cost of inaction? A single protracted disruption in the Gulf could cost the British economy billions in lost trade and higher energy costs. The market, as always, will price in that risk.
I have long argued that the government’s fiscal strategy lacks a credible plan for national resilience. The cuts to defence spending in the 2015 Strategic Defence and Security Review were a mistake, and we are now paying the price. The Royal Navy needs more hulls in the water, and it needs them now. The alternative is to rely on the United States Navy, which has its own competing priorities in the Pacific. That is not a strategy; it is an abdication of responsibility.
The Bank of England, meanwhile, must prepare for the inflationary consequences of any escalation. If the blockade persists, expect a spike in energy prices to feed through into core inflation, forcing the MPC to revise its forecasts. The market-implied path for Bank Rate has already shifted upwards, and further tightening would put additional strain on mortgage holders and businesses. The Chancellor must resist the temptation to intervene with subsidies or price caps, as that would only delay the necessary adjustment and distort market signals. Let the price mechanism work, but ensure our naval assets are in place to protect the underlying flow of trade.
Ultimately, the Hormuz crisis is a test of Britain’s willingness to defend its economic interests. The cost of doing nothing is far greater than the cost of deploying additional naval assets. The sailors are exhausted, but the alternative is a world where trade bows to the whims of a rogue state. That is a world where capital flight accelerates, gilt yields spike, and the pound comes under pressure. We must act now, or face the market’s judgment.
