He was the son of Robert Hamilton Lloyd-Anstruther (21 April 1841 – 24 July 1914) and wife (m London, 5 July 1871) Gertrude Louisa Georgina FitzRoy (London, 9 December 1850 – 17 July 1923), daughter of Francis Horatio FitzRoy (London, 6 June 1823 - Frogmore Park, 20 March 1900) and wife (m London, 27 November 1849) The Honorary
Gertrude Duncombe (Duncombe Park, 4 April 1827 - Frogmore Park, 24 February 1916). On 7 November 1910 he changed his name to FitzRoy Hamilton Niall Anstruther-Gough-Calthorpe, dropping Lloyd and adding his wife"s surnames. He served as a Lieutenant in the Army Motor Reserve prior to World War I and was appointed an Aide-de-Camp on the General Staff in September 1915, ending the war as a Captain.
He was created a Baronet on 1 July 1929.
