Sun Life Assurance Company of Canada & Ors v The Lincoln National Life Insurance Co

An arbitral determination creates an issue estoppel only if it was necessary and fundamental to the award. A conclusion stated after the tribunal has decided that the issue does not arise is collateral or obiter, even if included in the dispositive part of the award.

A stranger to a private arbitration cannot unilaterally hold a party bound by such a determination. Issue estoppel is mutual and operates only between parties or privies. An award may sometimes be a relevant fact, for example in quantifying loss or establishing an actual contractual position, but it cannot without agreement prove an underlying liability against a stranger.

Sun/Phoenix had obtained occupational-accident reinsurance from Cigna. A Cigna tribunal held that Cigna had validly avoided the reinsurance for misrepresentation and non-disclosure. It also stated that, subject to that avoidance, the relevant Unicover risks were reinsured.

Lincoln later arbitrated with Sun/Phoenix under a separate reinsurance containing a Net Retained Lines clause. The Lincoln tribunal concluded that Cigna had never agreed to cover the Unicover risks. Toulson J held that the Cigna award had instead determined that the risks were covered and that Lincoln could rely on that determination.

The appeal concerned whether the earlier award had decided the coverage issue with issue-estoppel effect, and whether Lincoln, a stranger to that arbitration, could rely upon it.

1. Appeal allowed. The court restored the Lincoln tribunal’s dispositive conclusion that Cigna never agreed to cover the Unicover reinsurances.

2. The meaning and effect of an earlier award, where the relevant circumstances are stated in or properly before the court, is a question of legal construction. It was therefore a question of law capable of consideration under Arbitration Act 1996, s 69. The court could construe the Cigna award for itself: [1972] AC 741.

3. The Cigna tribunal had expressed the view that, apart from avoidance, the Unicover book fell within Cigna’s cover. Its decisive finding, however, was valid avoidance. It expressly said that the remaining questions did not arise as a result. The coverage conclusion was neither necessary nor fundamental to that decision. It was collateral and obiter, notwithstanding its inclusion in the dispositive award. It consequently created no issue estoppel: [1966] 1 QB 630.

4. Accordingly, it was unnecessary to decide whether a stranger could ever invoke a necessary determination in an earlier arbitration. Mance LJ nevertheless held that the proposed one-sided principle had no legal foundation. Res judicata and issue estoppel are mutual and apply between parties and privies. Arbitration is consensual, private and cannot ordinarily compel joinder or consolidation. A stranger cannot choose to treat only favourable parts of a private award as conclusive against a party to it.

5. The obiter suggestion in George Moundreas that a stranger might prove the contractual position merely by producing an award was not a sound basis for extending issue estoppel. Longmore LJ agreed, identifying the absence of necessity as the ratio of the appeal. Jacob LJ also agreed, stressing that only operative consequences of an award may become a relevant fact beyond the arbitration.

• Court of Appeal (Civil Division): Allowed Sun/Phoenix’s appeal and restored the relevant part of the Lincoln tribunal’s award: [2004] EWCA Civ 1660.
• Commercial Court (Toulson J): Allowed Lincoln’s appeal on a question of law from the Lincoln arbitration. He held that the Cigna award had determined that the Unicover book was covered and could be relied on by Lincoln.
• Arbitrations: The Cigna tribunal held that Cigna had validly avoided its reinsurance. The Lincoln tribunal concluded independently that Cigna had never agreed to cover the Unicover reinsurances.