A contract for the carriage of goods shall not be subject to the presumption in paragraph 2. In such a contract if the country in which, at the time the contract is concluded, the carrier has his principal place of business is also the country in which the place of loading or the place of discharge or the principal place of business of the consignor is situated, it shall be presumed that the contract is most closely connected with that country. In applying this paragraph single voyage charter–parties and other contracts the main purpose of which is the carriage of goods shall be treated as contracts for the carriage of goods.