ColonelRobert William Pigott ClarkeCampbell-Preston, 3rd Battalion, Black Watch, born on 17 June 1865 at Culross, Fife, was the son of ReverendWilliamClarke Preston, and Anne CharityPiggot, of Valleyfield Mansion House, Culross, Fife.
His siblings were Elizabeth, Isabella, Mary Ann, Jane, Helen and Arthur.
Ardchattan descended through the daughter of Thomas Campbell, to the Clarke family of Comrie and thence to the Preston family of Valleyfield. Robert William Piggott Clarke Preston adopted the surname Campbell-Preston when he succeeded to the estate in 1878.
He was appointed to a commission as Lieutenant, 3rd (Royal Perth Militia) Battalion, The Royal Highlanders on 30 April 1884, promoted to Captain on 13 June 1889, and embodied for service on 14 December 1899 to 4 December 1900.
From 1894 to 1896, he acted as ADC to Lord Glasgow, Governor of New Zealand, and served in South Africa from 1900 to 1901.
He married Mary Augusta Margaret NicolThorne, daughter of AugustusThorne and Mary FrancesNicol, on 1 June 1905 at Ardchattan Priory, Bonawe, Argyllshire.
On 15 December 1903, he was promoted to Major, promoted to Lieutenant Colonel and appointed to command 3rd Royal Highlanders on 17 February 1912.
He was mobilized on 5 August 1914, awarded Brevet rank of Colonel (London Gazette dated 3 June 1918), promoted to Colonel on 3 June 1918, and appointed to Command No. 62 Labour Group Headquarters on 19 August 1918, with seniority from 17 February 1912. He ceased to be employed with the Labour Corps on 26 March 1919, and was disembodied 27 March 1919.
Brevet is a military commission conferred especially for outstanding service, by which an officer is promoted to a higher rank without the corresponding pay.
He was mentioned in Despatches (London Gazette dated 10 July 1919), and placed on the Retired List from 17 June 1922.
He held the office of Justice of the Peace and Deputy Lieutenant.
He died on 27 October 1929, age 64, at Ardchattan Priory.