[1] He saw active service in the Nile Expedition in 1898 during the Mahdist War, and was promoted to lieutenant in the regiment on 15 February 1899.

[2] Following the end of the war in June 1902, he returned with a large contingent of the guards regiments on board the SS Lake Michigan, which arrived in Southampton in October 1902.

[4] In 1908 Seymour left the army and became Comptroller in the household of Princess Helena of Waldeck and Pyrmont.

He rejoined the regular army following the outbreak of the First World War and was re-granted a commission in the Grenadier Guards on 19 August 1914.

[6] He was Comptroller to Princess Victoria of the United Kingdom between 1925 and 1935, and held the office of Extra Equerry to George V in 1935.