Speaking to TRT World, former Labour Member of Parliament and founder of the pro-EU campaign group New Europeans, Roger Casale, offered an insider’s perspective on what this “massively significant” result means for the Labour Party and the wider political landscape of the United Kingdom.

The End of the Starmer Era?

When asked whether Burnham’s return to Parliament marks the beginning of the end for Keir Starmer’s premiership, Casale was candid about the Prime Minister’s precarious position.

“The answer to your question is yes, it may well do, but I think the Labour Party will want to have an orderly transition and not create divisions,” Casale noted.

Much of the outcome now rests squarely on Starmer’s shoulders. While the Prime Minister has publicly insisted that he has a mandate to stay on, Casale explained that intense conversations are likely happening behind closed doors. To survive the mounting pressure, Starmer’s immediate strategy must be one of party cohesion.

“He would have to make a plea for unity, and he would have to remind his party, as he has been doing, of how divisions over the leadership… ruined the Conservatives’ chances for the next election,” Casale advised. “This has to be handled very carefully.”

A Looming Leadership Contest

The by-election not only paves the way for Burnham’s potential leadership bid but also triggers a cascade of subsequent electoral battles. Burnham’s transition to Westminster means a mayoral contest is now expected in Greater Manchester by late July.

However, the political dominoes won’t stop falling there. Casale cautioned that if Burnham successfully challenges Starmer and assumes leadership of the Labour Party, the country could soon face another nationwide poll.

“Let’s suppose that Andy Burnham does become leader of the Labour Party and the Prime Minister, there may well be a general election called as a result of that. So there are a lot of unknowns,” he warned.

The Rise of Reform and the Need for a “Progressive Front”

Beyond the internal Labour Party drama, Casale highlighted a deeply concerning trend hidden within the by-election’s vote share. While Burnham secured a commanding 55% of the vote—far exceeding Labour’s current 19% standing in national polls—the far-right made unprecedented gains. The Reform party captured a massive 35% of the vote, with an additional 7% going to a splinter faction, Restore.

Burnham’s success relied heavily on tactical voting, pulling roughly 20% of his support from Conservatives, Liberal Democrats, and Greens. For Casale, this cross-party coalition is the true takeaway from the election.

“I think what the result means is not just a question of the very good candidate which Andy Burnham was,” Casale explained. “It’s also a question of whether there can be a progressive front to fight off the far right.”

As the UK braces for the coming weeks of political turbulence, Casale left viewers with a stark warning about the shifting political spectrum, challenging moderates to unite against rising populism:

“Can people from all progressive parties—not just Labour, the Liberal Democrats, the Greens, and even some Conservatives—stand together in the face of a very serious threat from Reform?”

Roger Casale is the co-founder of the Defending Democracy Global Initiative and its flagship programme, the Westminster Alliance for Ukraine. Alongside co-authoring the podcast Eyes on Democracy, he remains a staunch advocate for human rights, democratic resilience, and international solidarity with Ukraine.

CIVIL Today News Desk

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