Infighting in the UK escalates! Burnham wins the by-election in a landslide, his chances of succeeding rise above 90%, cabinet ministers reportedly demand Starmer set a resignation date.
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UK Prime Minister Starmer is facing the most serious political crisis since taking office.
In a by-election for the House of Commons, heavyweight Labour figure and former Mayor of Greater Manchester Andy Burnham won overwhelmingly, seen by outsiders as a major step toward vying for the Prime Minister’s position. At the same time, according to two UK media outlets, several cabinet ministers have demanded Starmer set a timeline for resignation, with one telling him in person, “Your time is up.”
The political turmoil quickly reflected on market expectations. Prediction market Polymarket shows that as of Friday, the probability of Burnham becoming the next UK Prime Minister in 2026 has risen to 93%, while the probability of no new Prime Minister this year has dropped to just 3.5%. Investors are beginning to bet that Labour may enter a “post-Starmer era” ahead of schedule.
To reassure investors about his fiscal plans, Burnham has clearly stated that if he comes to power he will not change the government-set debt ceiling. However, after his victory was announced, the GBP/USD exchange rate still dipped slightly, fell below 1.3170 to hit a new low since late March, while UK government bond yields rose significantly; early in the European session, 10-year UK bond yields jumped over 6 basis points at open, continued trading near 4.82%, and closed at about 4.84%, up about 9 basis points on the day.
Burnham’s Key By-election Win: Vote Rate Over 50%
According to Xinhua and other media reports, on Friday, 19th local time, Burnham won the by-election for the Macfield constituency in northwest UK for the House of Commons, with a vote share of 54.8%, achieving a widely regarded nationally significant political victory.
In this election, Reform UK’s candidate Robert Kenyon got 34.5% of votes, placing second; Restore Britain party's vote share was under 7%.
After winning the by-election, Burnham will return to the House of Commons, which makes him eligible to compete for Labour leader and subsequently for the Prime Minister’s position.
This is Burnham's first major return to parliamentary elections in recent years. Analysts believe that as Labour’s support continues to slip and Starmer’s leadership is questioned, Burnham’s big win not only consolidates his influence in the party but also makes him the most popular candidate to replace Starmer.
Commentators note that this by-election result has effectively opened the door for Burnham to pursue No. 10 Downing Street, and has heightened market expectations of Labour's leadership change ahead of schedule.
UK Media: Cabinet Ministers Urge Starmer to Step Down: Your Time is Up
Pressure from within the party is rapidly mounting.
According to Financial Times reports, several government members disclosed that UK Transport Minister Heidi Alexander has told Starmer that for both the national interest and Labour’s benefit, he should proactively arrange a power transition and set a clear timeline for resignation to ensure smooth leadership transition.
However, Alexander’s spokesperson declined to comment on so-called private conversations.
As per CCTV citing The Times, several cabinet ministers plan to meet Starmer on the afternoon of the 19th local time to demand he set a timeline for stepping down.
The report says that some cabinet members will directly tell Starmer: “Your time is up.”
More and more in the Labour Party worry that under Starmer's continued leadership they may face major defeat in future elections, hence hoping to complete leadership transition as soon as possible.
Although no formal challenge has yet emerged, moves to force him out are shifting from behind the scenes to public view.
Prediction Markets “Overwhelming”: Burnham Victory Odds Top 90%
Market bets are getting more aggressive.
Polymarket’s predictions for “Who will become the next UK Prime Minister in 2026” show Burnham's odds breaking 90% on Friday, now at 93%, far ahead of other potential contenders.
Meanwhile, the market gives just a 3.5% chance that no new Prime Minister will emerge this year, meaning traders almost universally believe UK will see a leadership change this year.
This shift reflects market expectations moving from “Will Starmer step down” to “Who will replace Starmer?”
Analysts believe Burnham’s by-election victory not only marks his return to the national political stage, but may also be a turning point for Labour’s internal power reshuffle.
UK Bonds Under Pressure as “Post-Starmer Era” Trades Emerge
Political uncertainty has begun impacting financial markets.
As expectations of Labour's leadership change grow, UK government bonds have recently come under pressure, with yields rising for a time. Investors worry that if Labour replaces its leader early, future fiscal policy, tax arrangements, and the direction of economic reform may be adjusted.
The 55-year-old Burnham previously served as UK Health Minister and twice ran for Labour leader. Since becoming Mayor of Greater Manchester in 2017, he has built broad support in traditional Labour constituencies in northern UK and gained national prominence for repeatedly challenging the Conservative government during the pandemic.
Now, driven by his by-election win, internal party pressure, and betting on prediction markets, the focus of UK political discussion is no longer whether Starmer can finish his term, but in what way Labour will enter the “post-Starmer era.”
For 10 Downing Street, a leadership battle seems to have kicked off ahead of schedule.
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