English commercial lawyers warn Iran conflict will trigger a wave of force majeure and MAC clause disputes mirroring the COVID-19 and Ukraine litigation surges
English commercial lawyers are already being consulted by clients over the legal consequences of the US–Israel war with Iran, with practitioners predicting a wave of contract disputes in England comparable in scale and complexity to those generated by COVID-19 and Russia's invasion of Ukraine. The warning was reported on 30 March 2026, as the conflict entered its fifth week and its effects on global energy supply chains, shipping routes, and commodity markets continued to deepen. The core legal issues being raised include force majeure clauses (contractual provisions that excuse a party's non-performance when an unforeseeable event beyond their control makes performance impossible or radically different), MAC clauses (material adverse change provisions in acquisition and financing agreements that allow a party to walk away if the target or borrower suffers a defined deterioration), and frustration of contract under English common law. Iran's blocking of the Strait of Hormuz — now in its fifth week — is directly disrupting oil and energy supply contracts, shipping and logistics agreements, and commodity derivatives. English law governs a disproportionate share of global commercial contracts, meaning the English Commercial Court and London arbitration seats are likely to see the bulk of this litigation. The analogy to COVID-19 and Ukraine is precise: both generated multi-year waves of English law disputes over force majeure, sanctions compliance, and contract termination rights. Practitioners note that clients are already seeking early advice on how to position themselves — including whether to invoke force majeure now or preserve optionality — suggesting the disputes pipeline is building ahead of formal proceedings.
Why this matters
A conflict-driven disputes wave of this type activates commercial litigation, international arbitration, and transactional advisory practice areas simultaneously — the last because clients need real-time advice on whether MAC or force majeure clauses in live deals should be invoked or resisted. The English Commercial Court and LCIA (London Court of International Arbitration) are the natural seats for this litigation given English law's dominance in global commodity, shipping, and finance contracts. The 'why now' is the Strait of Hormuz closure generating immediate, quantifiable performance failures across energy and shipping contracts that cannot be deferred. Firms with strong commercial disputes, energy litigation, and arbitration practices are already seeing inbound advisory mandates.
On the Ground
On a force majeure dispute arising from the Iran conflict, a trainee would prepare a detailed chronology of the relevant events and their contractual notification deadlines, research the applicable English law test for force majeure and frustration across the relevant clause wording, and index disclosure documents including communications between the parties around the time of alleged non-performance. Skeleton argument research supporting counsel's submissions would also be standard junior work.
Interview prep
Soundbite
Hormuz closure is generating live force majeure notifications across English-law energy and shipping contracts — disputes teams are building pipeline now, before proceedings issue.
Question you might get
“How would you advise a client whose oil supply contract contains a force majeure clause, and the supplier is claiming the Strait of Hormuz closure entitles them to suspend delivery — what are the key legal tests under English law?”
Full answer
English commercial lawyers are already advising clients on the legal consequences of the Iran war, with a disputes wave predicted to rival COVID-19 and Ukraine in scale. The immediate legal flashpoints are force majeure clause invocations, MAC provisions in M&A and financing agreements, and frustration of contract claims — all under English law, which governs a dominant share of global commodity and shipping contracts. The English Commercial Court and will likely see the bulk of this litigation. The 'why now' is Iran's Strait of Hormuz closure directly causing quantifiable non-performance across live contracts. This suggests commercial disputes and arbitration teams will see sustained high-value instructional flow for the remainder of 2026 and beyond, as parties move from advisory to formal proceedings.
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