Farrar was one of the Transvaal delegates to the National Convention in 1908. Farrar was on the Transvaal inner Committee together with Jan Smuts, but Farrar had deep suspicions regarding Botha and Smuts, and distrusted the motivations of "Het Volk" party. Farrar was elected to the first Union Parliament in 1910 as member for Georgetown in Germiston. However, his stay in Parliament was short. In 1911 the Government Mining Engineer ordered an enquiry into irregularities and mismanagement at ERPM. Farrar resigned from Parliament to try to sort out the situation at ERPM.