Gladstone was the son of Sir Charles Gladstone and Isla Margaret Gladstone (née Crum), and a great-grandson of the former prime minister, William Ewart Gladstone. He was educated at Eton, and joined the Royal Navy Volunteer Reserve in 1943 and saw action in World War II mainly based on destroyers in the Indian Ocean. Upon leaving the navy (with the rank of lieutenant), he received an honours degree in history at Christ Church, Oxford. He then entered the teaching profession, with positions at Shrewsbury and Eton, and he became head master of Lancing in 1961. He retired from the teaching profession in 1969.
He married Rosamund Anne Hambro (born 1939) on 10 September 1962. They had three children: Charles Angus Gladstone (born 1964), Victoria Frances Gladstone (born 1967), and Robert Nicolas Gladstone (born 1968).
Rosamund is daughter of Major Robert Alexander Hambro (1910–43) and Barbara Jessica Hardy Beaton (1912–73). She is also a niece of Sir Cecil Beaton (1904–80)  and Lady Nancy Smiley (1909–99) married to Sir Hugh Houston Smiley, 3rd Baronet (1905–90).
Gladstone became a Scout whilst a student at Eton. He encouraged the school Scout Group whilst Head Master at Lancing. He became Chief Scout of the United Kingdom in 1972, a position he held until 1982. During his tenure he took special interest in the development of Scouting in deprived areas, particularly the inner cities and new housing estates. In 1979 he was elected Chairman of the World Scout Committee.
He died on 29 March 2018 at the age of 92.
- "Sir Cecil Walter Hardy Beaton". The Peerage.
- "Nancy Elizabeth Louise Hardy Beaton". The Peerage.
- "No. 55466". The London Gazette. 23 April 1999. p. 4575.
- Sir Erskine William Gladstone of Fasque and Balfour, 7th Bt.
- "Meet the Chiefs" (PDF). The Scout Information Centre. October 2004. Archived from the original (PDF) on 31 October 2007. Retrieved 8 December 2007.
- "Gladstone, of Fasque and Balfour, Kincardineshire". Cracroft's Peerage.
James Ellis Evans
| Lord Lieutenant of Clwyd
|Baronetage of the United Kingdom|
Charles Andrew Gladstone
|The Scout Association|
| Chief Scout of the United Kingdom
and Overseas Territories
|World Organization of the Scout Movement|
|| Chairman, World Scout Committee
Kamarul Ariffin bin Mohamad Yassin
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