A condition precedent in an excess insurance policy requiring underlying insurers to have 'admitted liability to pay the full amount of their indemnity' requires admission of both the fact and full extent of the insured's liability to the third party claimant, not merely an admission that the claim falls within the scope of cover. A grant of indemnity by the underlying insurer subject to a reservation of rights and conditional on a finding of liability does not satisfy such a condition. Section 52 of the Insurance Contracts Act 1984 (Cth) does not render void a condition precedent in an excess policy where the third party's inability to recover is attributable to the scope of s 51(1) rather than to the condition itself. The question whether estoppel by convention can apply to assumptions of law was left open.
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