16th May 2026
The big issue is that these emergency oil stocks were never designed to replace normal global supply for very long. They are a bridge — intended to calm markets, buy time for diplomacy, and prevent panic buying — not a permanent substitute for Middle East exports.
The International Energy Agency and its member countries agreed in March to release about 400 million barrels from emergency reserves after the Iran conflict and disruption around the Strait of Hormuz.
However, the scale of the problem is enormous:
Roughly 20% of world oil trade normally passes through Hormuz.
The IEA says current supply losses are running into millions of barrels per day.
Reuters reported cumulative supply losses may already exceed 1 billion barrels.
That means even a historically huge reserve release can disappear surprisingly quickly if disruption continues.
A rough way to think about it is:
400 million barrels sounds huge.
But the world uses roughly 100 million barrels of oil per day.
So globally, that reserve release is only equivalent to a few days of total world consumption.
Of course reserves are not intended to cover all global demand — they are meant to offset the missing supply — but if several million barrels per day remain offline for months, inventories begin draining very fast.
Reuters reported that by this week around 164 million barrels of the emergency release had already been used or committed.
The IEA still says member countries collectively maintain at least 90 days of net-import cover under treaty rules. But there are two important caveats:
“90 days” is based on net imports, not total consumption.
Stocks cannot all be released instantly because ports, pipelines, refineries and tanker logistics limit daily flow rates.
So the practical usable buffer is smaller than the headline number suggests.
For the UK specifically, the situation is slightly better than many people think — but also more fragile than governments usually admit.
The UK position today is roughly:
Britain still produces oil and gas from the North Sea.
The UK is relatively self-sufficient in petrol production.
But the UK imports significant amounts of diesel and aviation fuel.
The UK is heavily exposed to world market prices even if physical shortages are avoided.
The UK government confirmed in March that Britain holds emergency oil stocks equivalent to at least 90 days of net imports as required by IEA membership.
Some reports suggest the UK actually entered the crisis with closer to 120 days of oil stocks.
But there is an important structural weakness: unlike countries such as the US, Britain does not have one giant government-controlled strategic petroleum reserve. Most UK stocks are held commercially by refiners and fuel companies.
That creates risks because:
commercial firms may conserve stocks,
refinery bottlenecks matter,
diesel dependence is significant,
and panic buying can rapidly overwhelm distribution systems even before total stocks run out.
The UK is probably unlikely to see an absolute “no fuel left” scenario in the near term unless the conflict escalates dramatically. But what is much more plausible is:
very high petrol and diesel prices,
intermittent regional shortages,
rationing measures,
reduced airline schedules,
industrial slowdowns,
and pressure on inflation and interest rates.
If Hormuz disruption continued for many more months, governments would eventually face extremely difficult choices about prioritising essential users such as:
emergency services,
freight,
farming,
public transport,
electricity generation,
and military supply chains.
The deeper concern for markets is psychological. Strategic reserves work best when traders believe the disruption is temporary. If markets begin believing the crisis could last six months or more, reserve releases stop reassuring investors because everyone knows the stocks are finite.
That is why oil prices can keep rising even while governments are releasing reserves. Traders are effectively asking: “What happens after the reserves are gone?”
At the moment, the UK is probably in a “manageable but deteriorating” position rather than an immediate emergency. But if supply disruption persists deep into summer, the conversation could shift from price shocks to genuine physical supply security concerns across Europe.