In 1897 Freeman-Thomas was appointed aide-de-camp to his father-in-law, who was then the Governor of Victoria, Australia. Upon his return to the United Kingdom, Freeman-Thomas joined the Liberal Party and in 1900 was elected to the British House of Commons to represent the borough of Hastings. He then served as a junior lord of the Treasury in the Liberal Cabinet that sat from December 1905 to January 1906.
In 1897, Freeman-Thomas became an aide-de-camp to his father-in-law, who was the Governor of Victoria, Australia. Upon returning to the United Kingdom, he joined the Liberal Party and in 1900 was elected to Parliament as the representative for Hastings. He then served as a junior member of the Treasury in the Liberal government from December 1905 to January 1906.