Sir Charles obtained an honorary commission for Dmitri as a liaison officer with the British Mission and eventually persuaded the British Foreign Office in 1918 that Dmitri would become the next Emperor of Russia, gaining his admission to England after many previous rejections. Marling became an important father figure to Grand Duke Dmitri, and the relationship there established between the Grand Duke and the entire Marling family would prove to be close and enduring.See Sir Charles's correspondence with the Foreign Office, preserved at the Public Records Office, Kew, UK. Nikolai Nikolaevich's papers are at the Hoover Institute, Stanford, and Pavlovich's diaries likewise provide a detailed account of his life in Persia, his relationship with the Marlings and his attempts to gain entry to England.
