Andy Burnham arrives with a stronger hand than Starmer, but inherits the same riotous Parliamentary Labour Party

Posted: 20th July 2026, by Trafalgar Analytics.

FOR IMMEDIATE RELEASE

Think Tank: Andy Burnham arrives with a stronger hand than Starmer, but inherits the same riotous Parliamentary Labour Party, warns Trafalgar Analytics

LONDON, 20th July 2026 — Andy Burnham has today become Prime Minister, replacing Keir Starmer after his decisive Makerfield by-election victory last month and his unopposed election as Labour leader. Trafalgar Analytics assesses that Burnham arrives with a stronger hand than Starmer, for now, with the Corbyn and Polanski threat no longer as salient as it once was. However, Burnham inherits the same riotous Parliamentary Labour Party that made genuine reforms impossible for his predecessor.

A stronger starting position than Starmer

Burnham enters office in a markedly stronger position than his predecessor did at any point in the past year. His Makerfield result increased Labour's majority in the seat from 5,399 to 9,231 on a 9.6-point swing, and the parties that most threatened Labour's left flank through 2025 and early 2026 no longer pose as salient a threat. Jeremy Corbyn's "Your Party" is currently in disarray, whilst the Greens under Zack Polanski have since faltered from their high point in May 2026.

Why the parliamentary arithmetic still bites

That stronger hand, however, does not change the parliamentary arithmetic Burnham inherits. A record 30% of Labour MPs (123 out of 411) were elected at the 2024 general election with sub-40% vote shares, see Exhibit A. Trafalgar Analytics' Electoral Data Review (2025) found that just 17% of Labour MPs sit in genuinely safe seats, compared with 40% of Tory MPs under David Cameron and 77% under Boris Johnson, see Exhibit B. Most of the assumptions in that Review still apply a year on: these Labour MPs are terrified of losing their seats, and have every incentive to prioritise local survival over national reform.

Exhibit A: Vote share of seats won by winning party

Exhibit B: Summary Table of Exhibit A

Expect rebellions on welfare, taxes, Israel, and beyond. A personal poll bounce for Burnham does not change this underlying calculus. It may buy him a longer honeymoon than Starmer enjoyed, but it does not alter the number of Labour MPs who owe their seat to a bare plurality of local voters, nor their instinct to resist anything genuinely unpopular. Any serious reform agenda will run into the same wall of parliamentary self-preservation that defined Starmer's first year.

"Ultimately, politics is a numbers game. Andy Burnham is trapped by the same constraints that faced Starmer," said Amy Pierce, Associate (Elections and Polling) at Trafalgar Analytics. "No amount of public relations and strategic communications can overcome the fact that the Burnham Government will have to make tough choices at the Autumn Budget, and the Parliamentary Labour Party are unwilling to give consent."

Additional Information

Trafalgar Analytics' electoral data review (2025), "Starmer's First Year and Future of the Right," is available here.

Media Contact

Sarah Moore (Senior Communications Officer), Trafalgar Analytics

media@trafalgaranalytics.co.uk

ENDS

NOTES TO EDITORS

This release draws on analysis from the electoral data review "Starmer's First Year and Future of the Right" originally published by the Elections & Polling Team at Trafalgar Analytics, in 2025.
Key figures: 123 of 411 Labour seats (30%) were won with a vote share under 40% at the 2024 general election; just 17% of Labour MPs sit in seats considered safe (over 50% vote share).
"Starmer's First Year and Future of the Right" is available here.
Comments to the media provided by Amy Pierce, Associate (Elections and Polling) at Trafalgar Analytics.
For more information or interview requests, please contact Sarah Moore on media@trafalgaranalytics.co.uk.
Trafalgar Analytics is a British data analytics and research centre. Its work sits at the intersection between data science, economics, and political science. It believes in a data driven approach for tackling the foremost societal, economic, and political challenges of our time.

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