 Her career had previously been as a first assistant director, in which capacity she worked on popular series such as "Teachers", "Black Books", and "Casanova", until she became a producer in 2006.She produced "Invasion of the Bane", the pilot episode of "The Sarah Jane Adventures", a spin-off from "Doctor Who", on which she had worked as a first assistant director.During the production of the third series of "Doctor Who", Liggat produced one filming block (the two-parter "Human Nature"/"The Family of Blood") as holiday relief for regular producer Phil Collinson.