[2] He was promoted to Lieutenant on 20 May 1940,[4] and served aboard the cruiser HMS Cairo from June 1940 to December 1941, then the battleship HMS Howe (named after his illustrious ancestor the first Earl Howe) from May 1942 to July 1945, serving in the rank of acting temporary Lieutenant Commander from December 1943 until April 1944.

[7] Curzon succeeded to the title of Earl Howe on 1 September 1964,[1] taking his seat in the House of Lords, and making his maiden speech on 13 December 1965, during a debate on transport issues in Greater London.

In addition he served as Commissioner for the St John Ambulance Brigade for Buckinghamshire, 1953–1955, was a Trustee of the King William IV Naval Asylum in Penge.

[12] He was made a Commander of the Most Excellent Order of the British Empire in the 1961 Birthday Honours for "political and public services in Buckinghamshire".

They had two daughters: He was succeeded in the earldom by his second cousin, Frederick Curzon, 7th Earl Howe, who sits in the House of Lords as an elected hereditary peer.