2U.K.Where in respect of a claim referred to in paragraph 1 of this article an action is pending before a court or tribunal competent under that paragraph, or where in respect of such a claim a judgment has been entered by such a court or tribunal no new action shall be started between the same parties on the same grounds unless the judgment of the court or tribunal before which the first action was brought is not enforceable in the country in which the fresh proceedings are brought.