Unprecedented is an overused adjective in political commentary. Yet it aptly captures the current state of British party politics. Barely a year has passed since Labour’s 411-seat electoral landslide, and yet – without a severe constitutional, economic, or military crisis – the government’s popularity lies in tatters. When in this country’s political history has there been a parallel? Moreover, it is not the Conservatives who have benefited from this collapse in Labour support. They too have fallen dramatically in the polls.
Instead, with the emergence of new parties on both the Left and the Right, the established two-party system is under threat from fragmented allegiances. We may therefore be witnessing not merely the replacement of Labour or the Conservatives within a two-party system in British politics, but the structural demise of two-party politics itself. Such a systemic rupture would radically diminish the possibility of parliamentary majorities – the very foundation of British politics.
Why the present may prove so unprecedented can only be grasped in historical context. All party systems witness critical junctures: periods of transition when the status quo is re-ordered. Yet, the underlying mechanics of Britain’s party system have, until now, proved remarkably resilient. At any given point, Britain has only possessed two parties with a reasonable chance of winning a parliamentary majority and thus forming a government. Occasionally one of these two parties has split, altering the balance of the system, as with the Conservatives over the Corn Laws in 1846, the Liberals over Home Rule in 1886, or the emergence of the SDP in 1981. Only once, though, with Labour’s eclipse of the Liberals in the interwar years, have the participants in the party system changed.
However, that resilience now appears to be cracking. Even last year’s general election displayed embryonic signs: Labour’s apparent success masked the stark reality that their share of seats was almost double their share of the popular vote. Indeed, nearly 45% of votes cast were for neither the Labour Party nor the Conservatives. Since then, both the Liberal Democrats and Green Party have witnessed marginal rises in the polls. There have, however, been two shifts of greater significance. Public support for the provisionally-named Your Party has been immense, with estimates suggesting that over 800,000 people have signed up to join the nascent party – a membership figure several times larger than that of any existing rival. How far this split will erode Labour’s support remains to be seen. Then there is Reform UK’s meteoric rise in popularity. Originally founded as The Brexit Party in 2018, and rebranded the following year, Reform now lead opinion polls by a significant margin. Indeed, their popularity has nearly doubled since last year’s general election alone – a surge confirmed by sweeping gains in recent local elections.
These shifts confound the traditional wisdom of political scientists, suggesting a systemic rupture is indeed possible. Very few theories in the social sciences earn the epithet ‘law’, but Maurice Duverger’s seminal claim that plurality voting systems generate two-party systems is one of the rare exceptions. First proposed in the 1950s, Duverger’s law rests upon two related arguments. The first is mechanical: smaller parties struggle to win the majority necessary in individual constituencies to gain seats, unlike under proportional systems where vote share suffices. The second is psychological: anticipating this, individuals often vote for one of the larger parties to avoid ‘wasting’ their vote. It was the combined force of these mechanisms that prevented a systemic rupture with the SDP in 1983 and 1987, despite their having led in the polls in 1982. Yet the assumptions underpinning both mechanisms may no longer hold in Britain. With popular support now scattered across multiple parties, the threshold needed to secure a plurality is lower, and voters can no longer easily identify which of the larger parties is the likeliest winner for tactical purposes. The structural conditions for a transformation in the British party system have therefore never been more propitious.
If such a rupture were to occur, the implications for the fundamental character of British democracy would be profound. The so-called ‘Westminster model’, predicated on stable single-party majorities, would come under severe strain. With electoral support fragmented across numerous parties, it would become far harder for any one party to gain a parliamentary majority. Coalitions would then become a necessity. Yet even if the system holds despite splintered voting serious questions would remain about future governments’ democratic legitimacy and their capacity to carry popular support in office. Already, we may justly wonder whether Labour’s current lack of popularity is partially the result of having achieved such a large majority on only 33.7% of the vote. With turnout below 60%, only 20% of eligible British electors voted Labour last year, which is almost exactly their current polling figures. Such weak mandates jeopardise the very principle of representation central to democratic legitimacy: that politicians and policies should be chosen by, and therefore belong to, ‘the people’.
Time will only tell whether a systemic rupture in British party politics will occur, and if so which precise form it will take. Harold Wilson was surely correct that ‘A week is a long time in politics’, and there are four years until the next general election. Much could change in the political landscape: Labour may recover popular support in office, and the Conservatives may reinvent themselves. A transformation of Britain’s party system is not therefore inevitable, and predictions must remain tentative. Yet the fundamental point remains that Reform – and perhaps Your Party – pose genuine threats to the established order. Reform’s ability to mobilise support from the traditional heartlands of both Labour and the Conservatives suggests it is far more than a transient protest party. This breadth of appeal renders its threat unusually acute. Ultimately, the prospect of systemic rupture in 2025 is more real than at any time since the interwar eclipse of the Liberals.
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