Leonard Holmes à Court, 4th Baron Heytesbury

Heytesbury commissioned as an officer to enter the British Army in 1885, and was gazetted to the Wiltshire Regiment which rotated through various posts of the British Empire, at which time the regiment was dispatched to British India until 1895.^[3][4] In 1899, the regiment was dispatched to South Africa to take part in the Second Boer War.^[5] He remained active in the war until June 1902 and returned home on the SS Dominion, which arrived in Southampton that September.^[6]

On 15 August 1903, he succeeded his older brother William Holmes à Court as Baron Heytesbury (1828) and as a Baronet (1795) following his death.^[7]

Heytesbury retired from active military service in 1913, but returned the following year as a Lieutenant-Colonel at the outbreak of World War I and was made commander of the 3rd (Special Reserve) Battalion of the Wiltshire Regiment which provided reinforcement drafts for regular units serving overseas in wartime.^[8] Heytesbury was officially discharged and retired from military service in 1919 and received a brevet rank of colonel upon the completion of his service.

In 1933, Heytesbury sold the family estate, the Heytesbury House in Wiltshire, to poet and writer Siegfried Sassoon.^[9] The family then relocated to Green House, Crockerton, Wiltshire where he eventually passed away on 2 February 1949 at age 85.^[4]

On 9 September 1896, he married Sybil Mary Morris in Holy Trinity Church, Karachi, India (now Pakistan). She was the daughter of Capt. Frank Bird Morris and Juliet Mary Rawlatt. Capt. Frank Bird Morris was a British commissioned officer serving the British Army. Heytesbury and Sybil Mary had three children:

1. Hon. Sybil Nancy Bowly (née Holmes à Court) (1897-1970), born in Hyderabad. Married Lt Col Geoffrey Richard Marriott Bowly who served the Royal Warwickshire Regiment of the British Army and had two sons.
2. Hon. Betty Mary Robinson à Court (née Holmes à Court) (1902-1991), born in Warminster. Married firstly Commander Vivian John Robinson of the Royal Navy and had two sons and one daughter. Her first marriage ended in divorce in 1946. In 1956, she married a second time to Alfred Esmond Robinson who was the brother of her former spouse.
3. William Leonard Frank Holmes à Court (1906-1971), who succeeded the titles and later became the 5th Baron Heytesbury. He married Beryl Bredin Crawford and had one son.