Basil Hamilton-Temple-Blackwood, 4th Marquess of Dufferin and Ava

His widow married twice after his death, first to Major Harry Alexander Desmond ('Kelpie') Buchanan MC in 1948 (divorced 1954) and second in 1955 to judge John Maude QC (1901–1986), but against precedent always used the title she acquired from her first marriage. Maureen, Lady Dufferin, died on 3 May 1998 and is buried at Clandeboye.

Lord Dufferin was serving with the Indian Field Broadcasting Unit on 25 March 1945 when he was filmed demanding the surrender of Japanese troops who were sheltered in a tunnel; the film then captured Lord Dufferin's death when a Japanese mortar shell landed on the unit, just a few weeks short of his 36th birthday.

In 1940, he resigned from the government to join the British Army, refusing a post in the World War II coalition government of Winston Churchill. He received a commission as a captain in the Royal Horse Guards in July 1940 but was released from the Army in 1941 to become Director of the Empire Division of the Ministry of Information. The following year he undertook a special mission abroad for the ministry, and rejoined the Army in 1944.

After his return from India he was appointed Parliamentary Private Secretary to the 11th Marquess of Lothian, who was Under-Secretary of State for India, and then to the 3rd Viscount Halifax (later 1st Earl of Halifax) who was successively President of the Board of Education from 1932 to 1935, Secretary of State for War in 1935, and Lord Privy Seal from 1935 to 1937. Lord Dufferin was chairman of the Primrose League from 1932 to 1934, a Lord-in-waiting to King George VI from 1936 to 1937 and was himself appointed Under-Secretary of State for the Colonies in 1937, serving until his resignation in 1940.

After university Lord Dufferin pursued a career in politics. He made his maiden speech in the House of Lords in December 1931, aged just 22, during a debate on India. Only a few days later he was appointed to the Indian Franchise Committee which was to tour the country during its research.

On 3 July 1930, Lord Dufferin and Ava was married to brewery heiress Maureen Constance Guinness, the second daughter of Hon. Arthur Ernest Guinness, himself the second son of Edward Guinness, 1st Earl of Iveagh, at St. Margaret's, Westminster. They had three children:

Dufferin was the eldest child, and only son, of the 3rd Marquess of Dufferin and Ava and the former Brenda Woodhouse. Following his father's succession to the marquessate in 1918, he was known as the Earl of Ava. His grandfather, a descendant of the 18th-century playwright Richard Brinsley Sheridan, "was the cultured and worldly 1st Marquess of Dufferin and Ava", who served as the Viceroy and Governor-General of India.

Basil Sheridan Hamilton-Temple-Blackwood, 4th Marquess of Dufferin and Ava (6 April 1909 – 25 March 1945), styled Earl of Ava from 1918 until 1930, was a Conservative politician and soldier of the United Kingdom.