426. Prevention and hindrance of import and export.

Where the performance of a contract in the manner agreed is prevented by a prohibition or restriction on export or import or by the absence of a licence occurring without default of either party1, the contract may be frustrated2. The contract will in general not be frustrated if its terms permit performance in a number of ways and the prohibition only prevents one or some of these ways of performance3. A party who receives advance notice of a prohibition, and who with diligence could still perform in accordance with the contract before the prohibition comes into effect, cannot claim