Abstract
There are increasing studies on electoral reform which view electoral systems as dependent variable. These studies shift attention from the political consequences of electoral change toward the determinants of electoral reform. The paper analyses the electoral reform under the Blair government and the AV referendum of May 2011. The partisan bias worked in favor of the Labour Party since 1990s. Therefore, the rational choice approach fits uneasily with the action of the Blair government which weakened the traditional single-member district plurality system. The electoral reform since 1994 under the New Labor was the product of intra-party as well as inter-party politics. The AV referendum was also the product of inter-party bargaining in the context of the hung parliament. While different electoral systems such as MMP, SV and STV are adopted at sub-national level, there is still deep rooted support to the current plurality system at the Westminster parliament.
