Category: Dispute resolution · Reviewed by Tim Roche, Director · PI & Commercial · Last reviewed 2026-06-11
Insurance arbitration is the private, binding determination of insurance and reinsurance disputes by an arbitral tribunal appointed under the contract, governed in England and Wales by the Arbitration Act 1996 and most often conducted under the ARIAS UK Arbitration Rules.
Category: Dispute resolution Also known as: Reinsurance arbitration, Insurance ADR, Arbitral resolution of insurance disputes Related concepts: ARIAS UK, ARIAS Arbitration Insurance and Reinsurance Society, Coverage litigation, Insurance dispute
Insurance arbitration is a form of consensual dispute resolution in which the parties to an insurance or reinsurance contract agree, ordinarily in the policy or treaty itself, that disputes will be referred to one or more arbitrators rather than the courts. The resulting award is final and binding, with only limited rights of challenge. Arbitration is overwhelmingly the default forum for reinsurance disputes in the London market and is common in larger commercial insurance contracts, particularly those with cross-border elements where the New York Convention provides reliable enforcement.
The arbitral tribunal in an insurance reference typically comprises three members: one nominated by each party and a chair chosen by agreement or appointed by an institution such as ARIAS UK. Tribunals customarily include former underwriters, claims professionals, brokers or specialist counsel, which is one of the principal attractions of arbitration over generalist court proceedings.
The arbitration agreement is severable from the underlying contract (Arbitration Act 1996, section 7), meaning that a challenge to the validity of the policy does not automatically vitiate the agreement to arbitrate. The tribunal has competence-competence to rule on its own jurisdiction under section 30.
The Arbitration Act 1996 is the statutory framework governing all arbitrations seated in England, Wales and Northern Ireland. Its principles, stated in section 1, are that arbitration should obtain a fair resolution of disputes by an impartial tribunal without unnecessary delay or expense, that parties should be free to agree how disputes are resolved subject only to such safeguards as are necessary in the public interest, and that the court should not intervene save as provided by the Act.
Key provisions include section 9 (mandatory stay of court proceedings brought in breach of an arbitration agreement), section 33 (the tribunal’s general duty of fairness and to adopt procedures suitable to the circumstances), section 34 (procedural and evidential matters), section 44 (court powers in support of arbitration), section 45 (determination of preliminary points of law), and sections 67 to 69 (challenges to awards on substantive jurisdiction, serious irregularity and points of law respectively). The duty of confidentiality, although not expressly codified, is implied as a matter of English common law: see Dolling-Baker v Merrett [1990] 1 WLR 1205 and Ali Shipping Corp v Shipyard Trogir [1999] 1 WLR 314.
The Arbitration Act 2025 introduced refinements including a default rule that the law of the arbitration agreement follows the law of the seat where the parties have not chosen otherwise, a statutory duty of disclosure for arbitrators, and clarifications to the section 67 challenge procedure. Insurance practitioners should consult the latest consolidated text.
Institutional rules most commonly adopted include the ARIAS UK Arbitration Rules (current edition 2022, with prior editions in 2014 and 1997), the LCIA Rules, and the ICC Rules. The choice of rules affects appointment, procedural defaults and costs.
A typical insurance arbitration is commenced by service of a notice of arbitration on the respondent, in the form required by the applicable rules. Under the ARIAS UK Rules 2022, the notice identifies the claimant, the contract, the nature of the dispute and the relief sought, and triggers the time for the respondent to nominate its arbitrator.
Once the tribunal is constituted, it holds an early procedural conference at which it sets a procedural timetable, addresses confidentiality, disclosure (often more restrained than in court litigation), the use of factual and expert witnesses, and the form of hearing. Many tribunals adopt a memorial approach, with sequential exchange of full written cases supported by witness statements and expert reports, leading to a substantive hearing.
Evidence in insurance arbitration tends to focus on policy construction, the underwriting record, market practice, claims-handling history, and where relevant the technical loss. Witnesses include the placing broker, the underwriter who bound the risk, claims handlers and loss adjusters. Expert evidence may address market practice, accounting, actuarial, engineering, medical or other technical issues depending on the line of business.
The tribunal renders a reasoned award. Awards may be partial, dealing with discrete issues, or final. They are enforceable in England under section 66 of the Arbitration Act 1996 and abroad under the New York Convention 1958, to which over 170 states are parties.
Challenges to awards are narrow. Section 67 permits challenges on substantive jurisdiction, section 68 on serious irregularity causing substantial injustice, and section 69 on a point of English law, although section 69 is frequently excluded by institutional rules (the ARIAS UK Rules do not exclude it by default, but parties may agree otherwise). The Commercial Court is the principal supervisory court.
Reinsurance arbitration is the most common application. Treaty and facultative reinsurance contracts routinely incorporate arbitration clauses, often providing for ARIAS UK rules and a London seat. The cedant–reinsurer relationship gives rise to characteristic disputes on aggregation, follow-the-settlements, follow-the-fortunes, ex gratia payments and late notification.
Honourable engagement clauses historically released the tribunal from strict legal rules, directing it to act as honourable persons rather than strict legal arbitrators and to consider the spirit of the contract rather than its strict letter. Such clauses appear in many older reinsurance treaties. Their effect under the Arbitration Act 1996 is constrained: the tribunal still owes the section 33 duty of fairness, and an award that ignores English law as the governing law may face section 68 challenge. They remain valid where the parties’ intention is clear, but their practical force has narrowed.
Equity clauses are a related variation, directing the tribunal to decide ex aequo et bono. Section 46(1)(b) of the Arbitration Act 1996 expressly permits this if the parties have so agreed.
Ad hoc arbitration under bespoke clauses without institutional rules remains common in older policies and in particular sectors such as marine and energy. Many such clauses incorporate the procedures of the Chartered Institute of Arbitrators or specific industry bodies.
Bermuda Form arbitration under high-excess liability policies issued by Bermuda insurers typically applies New York substantive law to a London-seated arbitration, producing a distinctive hybrid procedural and substantive framework.
A UK-domiciled cedant places a £50 million property excess-of-loss reinsurance treaty with a panel of London market reinsurers, incorporating the ARIAS UK Arbitration Rules 2022. Following a catastrophe loss, the cedant claims under the treaty. One reinsurer disputes the aggregation of multiple individual losses into a single event, contending that the cedant’s interpretation breaches the “hours clause”.
The reinsurer serves notice of arbitration on the cedant. The cedant nominates its arbitrator, and the parties’ nominees together appoint a chair. The tribunal holds a procedural conference, sets a memorial timetable and directs limited disclosure of the cedant’s underlying claims data. After exchange of memorials, witness statements from the placing broker and the cedant’s chief claims officer, and expert reports on market practice on aggregation, the tribunal holds a five-day hearing. Eight weeks later it issues a reasoned award upholding the cedant’s aggregation in part. Neither party seeks to challenge the award; the reinsurer pays within the 28-day period stipulated in the award.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-11. Next review: 2026-12-11.
Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.
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