Party Legacies and Institutional Gravity: The Dynamic between Members of Parliament and Assembly Members in Wales

What does the creation of sub-national legislatures entail for the work of parliamentary representatives, and by what guidelines does the cross-level relationship evolve? This article considers the issue in the context of British devolution, relating the analysis of parliamentarians to the question of how parties adapt. The empirical analysis, drawing on a series of interviews with Assembly Members (AMs) and Members of Parliament (MPs) from Labour, the Conservative Party and the Liberal Democrats, shows that the infrastructure for communication between AMs and MPs differs considerably between the parties. Moreover, there are also key differences between parties with regard to how relations between individual representatives are resolved. Drawing upon insights from the institutionalist literature, the paper argues, first, that the creation of sub-national legislatures challenges party cohesiveness and, secondly, that how this challenge is met by the parties is guided by their distinct ideational and organisational legacies with regard to devolution.