"96. On the basis of the foregoing discussion, it seems clear, based on the underlying principle that a person is not permitted to take advantage of his own wrong, that a contractual party who is in breach of an obligation owed to the other party, will be prevented from asserting rights or claiming benefits which arise in consequence of his breach. The cases also show that, where this ‘prevention principle’ applies, it may be given effect in different ways. 97. In many cases, it will be appropriate to implement it as a substantive principle of law that precludes the wrongdoer from taking advantage of his own wrong, whatever the contract may say and however clearly the contract may appear to confer on the wrongdoer an unqualified right to enjoy such advantages. Cases like Rede v. Farr and the New Zealand Shipping case may be considered examples. 98. In other cases, where appropriate, the courts give effect to the principle as one of construction, holding that the contractual terms with which they are concerned must be construed by applying the principle as a canon or presumption of construction."