Home and Overseas Ins Co v Mentor Ins Co (UK), [1989] 1 Lloyd’s Rep 473
Principles of construction of contract.
Facts
Mentor Insurance entered in a number of reinsurance contracts with Home and Overseas Insurance under a standard form of contract with Clause (18), stipulating that disputes arising between the Parties were to be referred to arbitration. Clause (18) further provided that arbitrators were to “interpret this reinsurance as an honourable engagement”, and their award shall effect “the general purpose of this reinsurance in a reasonable manner, rather than in accordance with a literal interpretation of the language. When Mentor when into liquidation, Home and Overseas Insurance applied for a summary judgement for a recovery sums pursuant to the terms of the contract.
Issues
The question arose as to the effect of the words “honourable engagement” in the arbitration clause on the construction of the contractual terms as a point of law, and whether the parties should be, accordingly, permitted to a summary judgement by the court.
Decision/Outcome
The Court held that the effect of the “honourable engagement” provision within the arbitration clause is to permit arbitrators to, as in previous authorities, apply the principle that arbitrators should construe the terms of commercial contracts with view to achieving the commercial purpose of the transaction. Thus, the principle of construction allows the arbitrator to depart from the literal and ordinary meaning of the words in view of the commercial context and purpose of the contractual agreement, as well as in light of the stipulated purpose of the contract in its preamble. This applies particularly to ambiguous terms. However, this principle of contract construction does not permit arbitrators to depart from the law itself. The Court held that the requested summary judgment would require interpretations as to the proper construction of ambiguous contractual terms, which ought to be, instead, referred to arbitration to be determined according to the arbitration clause.
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Updated 19 March 2026
This case summary accurately reflects the decision in Home and Overseas Insurance Co v Mentor Insurance Co (UK) [1989] 1 Lloyd’s Rep 473. The core legal principles described — concerning the effect of ‘honourable engagement’ clauses in reinsurance arbitration agreements, the scope of arbitrators’ interpretive discretion, and the limits of that discretion (in that arbitrators cannot depart from the law itself) — remain good law and continue to be cited in the context of reinsurance arbitration and commercial contract construction.
Readers should be aware that the broader landscape of arbitration law in England and Wales has developed significantly since 1989, most notably through the Arbitration Act 1996, which consolidated and reformed arbitration law and governs the conduct of arbitration proceedings today. The 1996 Act has since been amended by the Arbitration Act 2025, which received Royal Assent on 24 February 2025 and introduces further reforms, though these do not affect the underlying interpretive principles addressed in this case. The principles of commercial contract construction have also been refined by the Supreme Court in cases such as Rainy Sky SA v Kookmin Bank [2011] UKSC 50 and Wood v Capita Insurance Services Ltd [2017] UKSC 24, which students should consider alongside this authority for a complete understanding of the modern approach to contractual interpretation.
