Chapter 5 traces the rise of arguments for ‘modernising the constitution’. While the 1970s left repeatedly engaged in British constitutional debates, their arguments were rarely conceived in terms of modernisation. However, the challenge of Thatcher’s rule, along Scottish nationalism, perceptions of sociological change, European integration, and geopolitical developments led to the ascendancy of new constitutional reforms (such as a bill of rights and devolution) in agendas for ‘modern socialism’. A pivotal development was the creation of the campaign group Charter 88; also important was the spreading New Left argument that European continental structures were more ‘modern’ than the ‘Westminster Model’. The political strength of constitutional modernisation arguments peaked in the early 1990s, under the leadership of John Smith and with public support from rising stars Blair and Brown. Momentum for reform later stalled under Blair. Nevertheless, Scottish and Welsh devolution and a Human Rights Act were locked into Labour’s platform by 1997, facilitating one of the most disruptive periods of British constitutional change in the contemporary era.