This paper considers the constitutional obstacles in Australia to the effective operation of a UK-style dialogue model of human rights protection. In Momcilovic v The Queen, the High Court of Australia relied upon separation of judicial power principles to frustrate the operation of dialogue models in Australia: whether enacted at the federal or State level. As a consequence, constitutionalism Australian-style – specifically, separation of powers implications – presents impenetrable obstacles to the effective operation of a UK-style dialogue model, and has locked in a limited role for the judiciary in the protection of rights.