UK Supreme Court sides with the Prestige's insurer: Spain must compensate it
The UK Supreme Court upholds that Spain and France must compensate the Prestige's insurer for suing in court instead of the policy's arbitration.
Almost 24 years after the sinking of the Prestige, the case keeps producing case law. The United Kingdom Supreme Court has ruled in favour of London Steam-Ship Owners' Mutual Insurance Association, the tanker's insurer, recognising its right to be compensated by Spain and France, Economía Digital reports.
The reason: the policy's arbitration clause
The ruling resolves the insurer's appeal against the two states' claims. The core issue is procedural rather than substantive: Spain claimed 855 million euros from the insurer before the Spanish courts, while the Prestige's policy provided for arbitration in London. The UK Supreme Court holds that by going to the ordinary courts instead of the agreed arbitration, Spain and France breached the policy's clause, opening the door to compensation in the insurer's favour. The ruling sets no specific amounts.
What the British Supreme Court was actually deciding
The dispute had been stuck for years on a technical question: the insurer maintained that the states' claims should have been channelled through the London arbitration provided for in the policy, and that by suing it in Spain the states had put themselves in breach of the insurance contract. British courts had already issued partial rulings on that theory, and the Supreme Court's judgment now confirms its essence: the obligation to arbitrate survives even when the claimant is a state and the damage claimed is massive. The court's logic is that of the autonomy of the arbitration clause, a cornerstone of international arbitration.
A litigation that never ends
The Prestige sank in November 2002 off the Galician coast after spilling more than 63,000 tonnes of fuel oil, in what remains one of the worst environmental disasters in Spain's history. Since then the case has passed through Spanish courts, British courts, the Court of Justice of the EU and international tribunals, with a steady drip of pronouncements on liability, insurance and jurisdiction.
Yesterday's decision does not close the economic chapter: by setting no amounts, it opens a new phase in which the parties will argue over the scope of the compensation recognised.
What happens now
With the right recognised but unquantified, the dispute enters a valuation phase. The insurer will have to specify the damage it suffered from the breach of the arbitration clause, a complex exercise when Spain's original claim ran to 855 million euros. The state's legal teams will have to choose between negotiating or prolonging the fight in arbitral proceedings, a decision with obvious budgetary significance.
Why it matters to law firms
Beyond the specific case, the ruling is a private international law lesson with daily application: the arbitration clause of a contract, here an insurance policy, produces effects even against states claiming for mass damage, and breaching it generates its own economic consequences. In cross-border practice, the choice between state courts and arbitration is no formality: it defines where you litigate, under which rules and with what risks of counterattack.
The judgment confirms, in any case, that the last chapter of the Prestige has not yet been written: 24 years on, the case keeps laying down rules on insurance, arbitration and state claims.
For firms with insurance, maritime or international litigation practices, the Prestige case proves once again that high-value conflicts are won as much on jurisdiction as on the merits.
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Fuentes
- economiadigital.es. Accessed 29 October 2026.
The specific data in this article come from the official sources cited.
