In December 1896 Law was transferred as commercial secretary to Vienna with supervision of Austria-Hungary, Russia, Italy, Greece, and the Balkan States. In that capacity he, with Francis Elliot, British minister at Sofia, negotiated a commercial treaty with Bulgaria in the winter of 1896–7. He represented Great Britain at Constantinople on the international committee for determining the indemnity payable by Greece after her war with Turkey in 1897. His influence helped to keep the amount within reasonable limits, and in the autumn he served at Athens on the international commission for the due payment of the indemnity and the regulation of Greek finance.