The Power of Backbenchers in the UK – Welfare Reform Bill 2025

Backbench MPs in the UK have gained increasing influence in recent years. However, their power to shape policy typically diminishes when a government holds a large majority. It was therefore a significant surprise when the Labour government was forced to retreat on its Welfare Reform Bill.

The bill proposed stricter eligibility criteria for Personal Independence Payments (PiP), which support individuals with long-term health conditions. As it progressed through Parliament, up to 120 Labour MPs signalled their intention to rebel. Faced with mounting internal pressure, the government was forced to water down the legislation ahead of the final vote. Although the bill ultimately passed with a majority of 75, by that point it had been stripped of any substantial reforms.

The rebellion was a major embarrassment for the government. The proposed changes were expected to save £5.5 billion, but Chancellor Rachel Reeves must now find those savings elsewhere—almost certainly by raising taxes.

While rebellions are rare, they are particularly unusual under a government with a strong majority. After all, why risk rebelling and potentially losing the whip, if the outcome is unlikely to change?

One explanation may be that backbench MPs are becoming more independent—possibly a response to the age of social media and 24-hour news cycles, which have made MPs more attuned to the views of their constituents than to party discipline. The episode may also indicate that Labour backbenchers perceive weakness in Keir Starmer’s leadership and believe they can exert greater influence.

Whatever the underlying reasons, the events of 2025 suggest that even a government with a commanding majority is no longer immune to the rising assertiveness of its backbenchers.