Jonathan Sumption argues that judges - especially those of the European Court of Human Rights - have usurped power by expanding the interpretation of human rights law. Lord Sumption argues that concepts of human rights have a long history in the common law. But by contrast, the European Convention on Human Rights has become a dynamic treaty, taking on new interpretations and powers. Article 8 – the right to private and family life – is the most striking example. Should these decisions be made by judges or parliament? The lecture is recorded before an audience in the old Parliament House in Edinburgh. The Reith Lectures are presented and chaired by Anita Anand and produced by Jim Frank. Editor: Hugh Levinson