A party who knowingly induces breach of contract is justified in doing so where the contract requires continued illegal conduct in contravention of statute, even if the statutory ground was not the actual motive for the interference. Justification for inducing breach of contract based on an equal or superior statutory right is a complete defence, and the question of justification is distinct from whether the contracting party was entitled to terminate. An estoppel cannot operate against the requirements of a statute or against a statutory authority having a duty to uphold the statute.
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