Category: Insurance case law · Reviewed by Simon Temme, Account Executive · Last reviewed June 2026
House of Lords ruling that breach of a promissory warranty in an insurance contract automatically discharges the insurer from liability from the date of breach, without the need for any election — a rule now reversed by section 10 of the Insurance Act 2015.
The vessel “Good Luck”, owned by a Greek shipping company, was insured against war risks with the Hellenic Mutual War Risks Association (“the Club”), a P&I-style mutual. The Bank of Nova Scotia (“the Bank”) had advanced funds to the shipowners and held a mortgage over the vessel. As part of the financing arrangements, the Club had given the Bank a “letter of undertaking” promising to notify the Bank promptly if the Club ceased to insure the vessel for any reason.
The Club’s rules contained a warranty restricting the vessel’s trading area. The owners traded the vessel into the Persian Gulf in breach of that warranty during the Iran-Iraq war. The “Good Luck” was subsequently struck by Iraqi missiles and became a constructive total loss.
When the owners claimed under the policy, the Club refused to pay, asserting breach of the trading-area warranty. The Bank, having received no notification from the Club that cover had ceased, sued the Club for breach of the letter of undertaking. The Bank argued that the Club had failed to give prompt notice that the vessel was no longer insured.
The factual narrative therefore required the House of Lords to decide precisely when, in legal terms, the vessel had ceased to be insured: was it on the date of the breach of warranty, or only when the Club elected to treat the policy as at an end? If the former, the Club’s obligation to notify the Bank crystallised at the date of the breach; if the latter, no breach of the undertaking might have occurred at all.
The principal legal issue was the effect of breach of a promissory warranty in a contract of insurance, in particular under section 33(3) of the Marine Insurance Act 1906. That subsection provides that the insurer “is discharged from liability as from the date of the breach of warranty” subject to any contrary express provision. The question was whether discharge occurred automatically as a matter of law on breach, or whether (as had sometimes been suggested) the breach merely gave the insurer the right to treat itself as discharged, which had to be exercised by election.
A secondary issue was whether, on the facts, the Club’s failure to notify the Bank that the vessel had ceased to be insured was a breach of the letter of undertaking, and what damages flowed.
The House of Lords (leading speech by Lord Goff of Chieveley) held that breach of a promissory warranty in a contract of insurance discharges the insurer automatically from liability as from the date of the breach. No election is required and no act on the part of the insurer is necessary. The contract is not avoided ab initio but the insurer’s liability under it is brought to an end prospectively from the moment of breach.
Applying that conclusion to the facts, their Lordships held that the vessel had ceased to be insured at the moment the warranty was breached by entering the prohibited zone. The Club had therefore been under a duty to notify the Bank that the vessel was no longer insured, and its failure to do so was a breach of the letter of undertaking. The Bank succeeded in its claim against the Club.
Lord Goff reasoned that section 33(3) of the 1906 Act was declaratory of the common law and that the language “discharged from liability” was decisive: there was nothing for the insurer to elect to do because liability simply ceased by operation of law upon breach.
Breach of a promissory warranty in an insurance contract automatically discharges the insurer from liability for losses occurring after the date of the breach. The discharge takes effect by operation of law: it does not depend on the insurer’s election, knowledge of the breach, or any act of acceptance. The contract itself is not avoided, but the insurer’s prospective obligations under it come to an end at the moment of breach, irrespective of whether the breach is causative of any loss or capable of remedy.
The Good Luck became the leading authority on the consequences of breach of warranty in insurance contracts and was a settled — but heavily criticised — feature of English insurance law for over two decades. Its strictness produced harsh results: insureds could lose cover for breaches wholly unrelated to the loss, with no opportunity to remedy the breach, and no ability to be reinstated even if the breach was temporary or innocent.
The decision was the focus of sustained criticism by the Law Commission and the Scottish Law Commission, culminating in their 2014 report (Law Com No 353). Parliament responded by enacting the Insurance Act 2015. Section 10 of the 2015 Act expressly abolishes the rule of automatic discharge for breach of warranty in non-consumer insurance contracts. Instead, breach of warranty now merely suspends the insurer’s liability during the period of breach; once the breach is remedied (where capable of remedy), cover resumes. Section 11 goes further and prevents an insurer from relying on non-compliance with a term (including a warranty) where compliance would not have reduced the risk of the loss that actually occurred.
The Good Luck nevertheless remains historically important, and its reasoning continues to inform questions of construction and the meaning of “discharge” in older policies, run-off business, and contracts where the 2015 Act has been contracted out of in accordance with the Act’s transparency requirements.
By Matt Bartlett, Director, on 2026-06-06. Next review: 2026-12-06.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-06. Apex Insurance Brokers Limited, FCA FRN 724952, Companies House 07014570. Not regulated advice — consult your broker on your specific position.
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