Back to the Westminster Model? The Brexit process and the UK political system

This article investigates the impact of Brexit on the British political system. By critically engaging with the conceptualisation of the Westminster model proposed by Arend Lijphart, it analyses the strains of Brexit on three dimensions teased out from Lijphart’s framework: elections and the party system, executive–legislative dynamics and the relationship between central and devolved administrations. Supplementing quantitative indicators with an in-depth qualitative analysis, the article shows that the process of Brexit has ultimately reaffirmed, with some important caveats, key features of the Westminster model: the resilience of the two-party system, executive dominance over Parliament and the unitary character of the political system. Inheriting a context marked by the progressive weakening of key majoritarian features of the political system, the Brexit process has brought back some of the traditional executive power-hoarding dynamics. Yet, this prevailing trend has created strains and resistances that keep the political process open to different developments.