Plot of the parameter regime explored in the simulations. The diagram shows disc mass against binary separation, with the red area denoting the region where the Kozai mechanism should operate, and the cyan area showing the region where it should not for a planetesimal located at 11 AU. The symbols denote the outcome of the simulations, where a cross implies that the Kozai effect was switched off, and an open square indicates that the Kozai mechanism operates. The dashed and dotted line represents the same boundary for a body at a_i = 6 AU and a_i = 15 AU respectively.