 Hattorf was one of fifteen ministers and advisers who came to Great Britain with George I in 1714.From that year until 1723, he served as secretary of the German Chancery with Andreas Gottlieb von Bernstorff as head.In July 1719, Hattorf and Northern Secretary James Stanhope, 1st Earl Stanhope, pushed Bernstorff out of office, leaving Hanoverian politics to fall into the hands of British ministers.