AND WHEREAS provision is made in the said Convention as amended by the said protocols for the application by means of a notification of extension given by either of the said Governments to the other Government and acceptance thereof by the other Government of the said Convention as amended, subject to such modifications, if any, as may be specified in the notification, to all or any of its Colonies, overseas territories, protectorates or territories in respect of which it exercise a mandate or trusteeship, which impose taxes substantially similar in character to those which are the subject of the said Convention.