Warner was a proponent of the establishment of non-denominational schooling in Trinidad at a time when education was closely linked to religion and few thought education could function without the inclusion of religious instruction. Warner opposed the establishment of government-funded denominational schools in Trinidad because given the Catholic majority in the island, these would have been Catholic and either French or Spanish. In 1838 Warner, then acting solicitor general, proposed to the Council of Government that the government support the
Lady Mico Charity to establish non-denominational schools in Trinidad. This was opposed to the Lieutenant Governor,
Sir George Hill, but after his death the following year Warner was able to convince the council to pledge support to the charity, but only on a limited basis with no promise of ongoing support. Warner envisioned both Catholics and Protestants attending these schools, and saw them as a means to promote social harmony and English culture. However, without adequate financial support, the Mico schools collapsed and the government instead provided support for Catholic and Anglican denominational schools. When Sir
Henry McLeod was appointed governor in 1840, Warner tried again to establish non-denominational schooling. In 1846, just before McLeod's departure, a plan was approved, but there was insufficient funding. McLeod's successor as governor, Lord Harris, was able to establish a system of government-funded non-denominational schools by dividing the island into wards, with local taxes collected in each ward going to support the schools. Historian Carl Campbell was unable to ascertain the degree to which Warner was involved in the establishment of the system of ward schools, despite its obvious connections to the plans worked out by Warner and McLeod. After the system of ward schools was established, Warner worked to create educational opportunities in Trinidad for members of the upper class who would otherwise have sent their children to Britain or France. In 1859 the
Government College was opened. It was staffed by graduates of the
University of Cambridge and scholarships were provided annually to send the top two graduates to Cambridge. == Later career ==