First-Past-The-Post System No Longer Guarantees Dominance for UK Labour and Conservatives

The UK's first-past-the-post electoral system, traditionally seen as a bulwark for Labour and the Conservatives, appears to be turning against its erstwhile beneficiaries. Local election results have highlighted a significant fragmentation of the electorate, with smaller parties making substantial gains, challenging the established two-party dynamic.

Historically, the first-past-the-post system has made it arduous for minor parties with geographically dispersed support to secure parliamentary representation, thereby insulating the two main parties. It also amplified the victor's seat count, facilitating majority governments. However, recent local elections suggest this traditional advantage is eroding.

Analysis of Thursday's election results indicates that if a national local election had been held, Reform would have topped the poll with 26% of the vote, followed by the Greens with 18%. The Conservatives and Labour would have each garnered a mere 17%, marking a record low combined share of 34%. The Liberal Democrats were not far behind, securing 16%.

This surge in support for third parties suggests that the argument of a 'wasted vote' for non-major parties has lost its efficacy. Reform and the Greens collectively secured 2,063 council seats, surpassing the combined 1,864 seats won by the Conservatives and Labour. The Liberal Democrats also claimed 842 local council seats.

This contrasts sharply with the 2024 general election, where, despite over 20% of the vote, Reform and the Greens jointly secured only nine parliamentary seats, while Labour and the Conservatives took 533. In the recent local elections, the system appears to have exaggerated the decline in support for the two main parties, particularly in wards they were defending. Labour's support dropped by an average of 25 points in defended wards, while the Conservatives saw a 14-point decline.

The fragmented political landscape also enabled Reform to win majorities in several councils, such as Dudley, Plymouth, and Rochdale, despite securing less than half of the vote. In some instances, Reform achieved 67% of the seats with just 36% of the vote. Labour similarly benefited in Ealing and Merton, winning substantial seat majorities with only 29% of the vote.

This disproportionate reward for a relatively low winning share of the vote is a hallmark of the first-past-the-post system in a multi-party environment, raising the prospect of governments formed with limited popular mandates. Furthermore, the system can enable a party losing overall support to gain seats if its principal opponents are declining more steeply, as demonstrated by the Conservatives' gain of Westminster council despite a five-point drop in their own support.

Even with its tendency to favour winners, the current crowded political field means the first-past-the-post system cannot guarantee an overall majority for any single party. A third of the 63 councils where all seats were contested are now under no overall control, a significant increase from just half a dozen previously. This shift foreshadows profound changes in how UK elections are contested, how Parliament operates, and how governments will rule in an increasingly multi-party era.