Tensions in the Persian Gulf have escalated significantly following Iran’s latest assertions over the Strait of Hormuz, a narrow waterway through which nearly 20% of the world’s oil passes. The Iranian Revolutionary Guard Corps has issued warnings that they may restrict passage, directly threatening British tanker routes and, by extension, the UK’s energy supply lines.
This is not a new crisis but an intensification of a long-running geopolitical pressure point. The Strait of Hormuz, at its narrowest just 33 kilometres wide, is a chokepoint for global energy flows. For the United Kingdom, which imports roughly 10% of its crude oil from the Gulf region and relies on seaborne liquefied natural gas, any disruption would translate to immediate price volatility and potential supply shortages.
The data are stark. According to the UK Department for Business and Trade, the UK imported 11.4 million tonnes of crude oil in 2023 from the Middle East, with a significant fraction transiting the Strait. Iran’s history of harassing commercial vessels, including the seizure of the oil tanker Stena Impero in 2019, demonstrates a willingness to leverage this geography as a political weapon.
The Iranian claim rests on legal ambiguities. Though the Strait is considered international waters under the United Nations Convention on the Law of the Sea, Iran insists on the right to regulate traffic for environmental and security reasons. This is a legal fiction that masks a real threat: the Islamic Republic’s ability to deploy fast-attack craft, mines, and anti-ship missiles to effectively blockade passage.
For the Royal Navy, this places a disproportionate burden on a fleet already stretched thin. The UK maintains a presence in Bahrain as part of the Combined Maritime Forces, but the assets available for Hormuz escort duties are limited. A single Type 45 destroyer or frigate cannot guarantee safety for the dozens of UK-flagged tankers that transit the waterway each month.
The economic consequences would cascade. Any spike in oil prices due to supply disruption would feed directly into UK inflation, which stood at 4.0% in January 2024. The Bank of England would face a dilemma: raise rates to cool prices or hold steady to protect growth. Meanwhile, household energy bills, already elevated since the Russia-Ukraine conflict, would climb further.
Longer term, this crisis underscores the urgency of the energy transition. The UK’s North Sea reserves are declining, and new renewables projects take years to come online. Diversifying supply sources, increasing strategic petroleum reserves, and accelerating domestic clean energy production are not just climate imperatives but national security necessities.
The science is clear: our reliance on fossil fuels extracted from geopolitically volatile regions is a systemic risk. Each barrel of oil carries not just carbon but geopolitical tension. Iran’s latest gambit is a reminder that the physics of climate change and the politics of energy are intertwined. The Strait of Hormuz is not only a chokepoint for oil tankers but for our collective ability to decarbonise before the biosphere’s limits are breached.
As I have reported before, the planet is warming because we continue to burn fossil fuels. That simple physical reality is the backdrop to every energy security crisis. Iran’s threats are a short-term spike in a long-term fever. The only cure is to reduce our dependence on the resource that fuels both our economies and our conflicts.
For now, the Royal Navy will increase patrols, the Treasury will monitor prices, and the Foreign Office will pursue diplomatic channels. But the underlying vulnerability remains. Every cubic metre of gas, every barrel of oil that travels through the Strait of Hormuz is a liability. The global energy system is like a card tower: stable until the slightest tremor makes it collapse. Iran has just rattled the table.
