Holyoak was the chairman of the
Hong Kong General Chamber of Commerce in from 1917 to 1918 and 1920 to 1921. He was nominated as unofficial member of the Legislative Council as a representative of the chamber on the death of
E. A. Hewett in 1915 and later on was appointed to the Executive Council for various times. Despite being a large contributor to the raising funds during the
First World War, in early 1917 Holyoak moved in the Legislative Council to exclude German merchants from the colony for ten years, mandated by the Chamber of Commerce. In 1919, he and
Henry Pollock formed the
Constitutional Reform Association of Hong Kong to demand London for a further representation in the colonial legislature. He also associated with the Chinese community in public work such as his chairmanship of the Joint Committee of the Hong Kong General Chamber of Commerce and the
Chinese General Chamber of Commerce which supervised the arrangements for the Hong Kong section of the
Wembley Exhibition. ==Death and family==