Topological insulators (TIs) are of inherent interest as they are conducting on the surface whilst insulating on the bulk. We would like to investigate magnetically doped topological insulators in the bulk using muon relaxation. By doping the binary TIs Bi2Se3 and Bi2Te3 with 3d transition metal elements, we wish to establish a reliable baseline for ferromagnetic doping of ternary and quaternary compounds of the tetradymite class containing Bi-Se-Te-Sb. This investigation is important as the well understood basic physical properties will allow devices to be built in the future. This work is part of a wide collaboration to fully understand the properties of doped TIs using both bulk and surface techniques. As such EMU would be an ideal place to characterise the basic magnetic properties, including the volume fraction of these materials.