Edgcumbe was also an Aide-de-Camp to Queen Victoria from 1887 to 1897 and a Member of the Council to the Prince of Wales from 1901 to 1917 as well as Keeper of the Seal of the Duchy of Cornwall from 1907 to 1917.
In early 1901 Lord Mount Edgcumbe was appointed by King Edward to lead a special diplomatic mission to announce the King´s accession to the governments of Belgium, Bavaria, Italy, Württemberg, and the Netherlands [REF].