[en] Parity non-conserving (PNC) optical rotation has been measured in the 6²P_1/2 → 6²P_3/2 1.28 μm M1 transition in atomic Tl with a polarimetry method. PNC is measured as the amplitude of a dispersive lineshape of optical rotation across the transition. The technique is sensitive to ∼ 10^-8 rad. This allows precise measurement of the nuclear spin independent contribution to atomic PNC, and measurements on different hyperfine components of the transition will allow improved measurement of the nuclear spin dependent contributions, including the anapole moment of the nucleus. The study of PNC in this transition in Tl also provides comparison to other PNC work in the 6²P_1/2 → 7²P_1/2 transition in Tl. We will present current results for Tl with comments on systematic errors. We will also discuss prospects for future work in atomic PNC with this method, including studies of isotopically enriched samples of high Z atoms (e.g. Pb) in which we expect measurement of ratios of PNC in different isotopes to be less affected by uncertainties in atomic calculations and more sensitive to electroweak physics