After being an unpaid assistant to the Mineral Adviser to the Office of Woods from 1890 to 1891, he went to Siam. There he was Secretary of the
Royal Department of Mines and Geology from 1891 to 1895 and Director General from 1895 to 1897. He became a Commander of the
Order of the White Elephant of Siam and received the
Murchison Award of the
R.G.S. for journeys in Siam in 1898. In 1898, he was secretary of the Siamese legation from 1898 to 1901. Warington Smyth was called to the bar in 1899 and in 1900 was delegate for
Siam to the
Congres International, Paris Exhibition. In 1900, he was Hon Secretary for London of the National Committee for the organization of a
Volunteer Naval reserve. In 1901 he went to
South Africa where he was Secretary for Mines in the
Transvaal from 1901 to 1910. He was also Member of Legislative and Executive Councils, Transvaal in 1906 and 1907 and a JP and Advocate of the Supreme Court of the Transvaal. He was also President of the Transvaal Cornish Association from 1907 to 1910, in which year he was awarded the
Queen's South Africa medal. From 1910, he was Secretary for Mines and Industries in South Africa and Commissioner of Mines for Natal as well as Chief Inspector of Factories. He took an active part in
World War I as an Acting Sub Lieutenant RNR in 1914, serving as Assistant Naval Transport Officer in the
South-West Africa Campaign 1914 to 1915, when he was mentioned in dispatches. He became Lieutenant RNVR and Acting Naval Senior Officer at the Cape from 1915 to 1916, and Controller of Imports and Exports for the
Union of South Africa in 1917. In 1919 he was awarded the
C.M.G. Following the war, he was South African government delegate to the
International Labour Conferences at Washington in 1919 and Geneva in 1922. He retired in 1927 and returned to England, living at
Falmouth, Cornwall where he enjoyed yachting. In
World War II, he was still active in the RNVR, serving in 1940 as Lieutenant Commander. He died in 1943 at
Redruth. ==Family==