Keir Starmer confronts acute leadership instability as Labour's approval ratings hit historic lows, with net favourability at -48 per recent YouGov polling and half of Britons calling for his resignation amid the Peter Mandelson US ambassador vetting scandal. Calls to step down have escalated from Labour MP Jonathan Brash, peer Lord Glasman, and anonymous ministers labeling it a "tipping point," fueled by by-election humiliations and internal factional talks of a transition. The April 29 Golders Green synagogue stabbings, linked to an Iran-backed group despite the suspect's mental health history, prompted Starmer's security funding pledges but amplified criticism. May 2026 local elections pose high jeopardy, potentially triggering a formal leadership challenge despite Labour's parliamentary majority barring easy no-confidence defeat.
Eksperymentalne podsumowanie AI odwołujące się do danych Polymarket. To nie jest porada handlowa i nie ma wpływu na rozstrzyganie tego rynku. · ZaktualizowanoDowning Street confirms Starmer will stay Prime Minister beyond the current Parliament – The Independent reported an official Downing Street statement that Starmer will remain in
April 30 dips to 0%1%
Downing Street confirms Starmer will stay Prime Minister beyond the current Parliament – The Independent reported an official Downing Street statement that Starmer will remain in office “throughout this Parliament and beyond,” providing the final reassurance that eliminated any remaining probability of his departure before the market’s cut‑off.
Market reaches 0 With no credible resignation news and the cumulative effect of the Mandelson scandal and Robbins dismissal, the market
April 30 dips to 0%1%
Market reaches 0 With no credible resignation news and the cumulative effect of the Mandelson scandal and Robbins dismissal, the market
ABC News confirms Parliament’s final vote against an inquiry into Starmer’s handling of the Mandelson appointment, cementing his survival and pushing the market’s “Yes”
April 30 dips to 0%3%
ABC News confirms Parliament’s final vote against an inquiry into Starmer’s handling of the Mandelson appointment, cementing his survival and pushing the market’s “Yes” probability to 0 %
Politico reports Starmer leaving Downing Street, underscoring the perception that his premiership is on the brink after a turbulent week
May 15 drops to 8%6%
Politico reports Starmer leaving Downing Street, underscoring the perception that his premiership is on the brink after a turbulent week
Live PMQs show Starmer surviving a “bruising” Commons day as backbench pressure eases – The Guardian’s briefing noted that despite intense scrutiny, Starmer emerged unscathed from
Live PMQs show Starmer surviving a “bruising” Commons day as backbench pressure eases – The Guardian’s briefing noted that despite intense scrutiny, Starmer emerged unscathed from the session, confirming that no immediate parliamentary action would force him out.
Fact‑check: Supreme Court did not order Starmer to resign – Reuters fact‑check clarified that the UK Supreme Court has no power to force a Prime Minister’s resignation and had
April 30 dips to 1%3%
Fact‑check: Supreme Court did not order Starmer to resign – Reuters fact‑check clarified that the UK Supreme Court has no power to force a Prime Minister’s resignation and had made no such order, quashing a viral claim that could have triggered a market spike toward “Yes”.
MPs vote 223 for – 335 against referring Starmer to the Privileges Committee, decisively rejecting the opposition’s bid to launch an inquiry
April 30 dips to 5%3%
MPs vote 223 for – 335 against referring Starmer to the Privileges Committee, decisively rejecting the opposition’s bid to launch an inquiry
Downing Street declares Starmer will remain Prime Minister beyond the current Parliament – The Standard reported an official statement that Starmer will stay in office, removing
April 30 dips to 0%1%
Downing Street declares Starmer will remain Prime Minister beyond the current Parliament – The Standard reported an official statement that Starmer will stay in office, removing any credible trigger for a resignation and pushing the market
No resignation announcement; Labour MPs publicly back Starmer Following a series of cabinet‑level resignations earlier in the month, senior Labour figures reiterated their
April 30 dips to 1%1%
No resignation announcement; Labour MPs publicly back Starmer Following a series of cabinet‑level resignations earlier in the month, senior Labour figures reiterated their confidence in Starmer, leaving traders with no trigger for a “Yes” outcome
UK parliament votes against launching an inquiry into Starmer’s handling of the Mandelson appointment – The decisive vote removed the immediate threat of a parliamentary probe,
April 30 drops to 0%6%
UK parliament votes against launching an inquiry into Starmer’s handling of the Mandelson appointment – The decisive vote removed the immediate threat of a parliamentary probe, sending the market’s “Yes” probability to zero and effectively ending the risk of a resignation before the market’s end date.
Guardian article shows Starmer fending off a major Labour rebellion over a parliamentary inquiry into Mandelson, confirming his dwindling political capital
May 15 dips to 14%3%
Guardian article shows Starmer fending off a major Labour rebellion over a parliamentary inquiry into Mandelson, confirming his dwindling political capital
ITV reports the Commons vote outcome and Conservative leader Kemi Badenoch’s warning that Labour MPs will “rue the day” they blocked the referral, underscoring the political stakes
April 30 dips to 3%2%
ITV reports the Commons vote outcome and Conservative leader Kemi Badenoch’s warning that Labour MPs will “rue the day” they blocked the referral, underscoring the political stakes
Starmer rallies cabinet, whips and former PM Gordon Brown to shore up Labour support ahead of the Mandelson vote, describing the day as “critical” for his premiership
April 30 dips to 10%1%
Starmer rallies cabinet, whips and former PM Gordon Brown to shore up Labour support ahead of the Mandelson vote, describing the day as “critical” for his premiership
Reuters reports Parliament will vote on a possible inquiry into whether Starmer misled the Commons over the Mandelson appointment – Anticipation of a damaging inquiry briefly
April 30 jumps to 6%5%
Reuters reports Parliament will vote on a possible inquiry into whether Starmer misled the Commons over the Mandelson appointment – Anticipation of a damaging inquiry briefly revived “Yes” odds, producing the small rebound seen on April 23‑25.
Starmer urges Labour MPs to “stick together” ahead of critical Privileges Committee vote – In a televised address, Starmer called for unity as the standards investigation loomed,
Starmer urges Labour MPs to “stick together” ahead of critical Privileges Committee vote – In a televised address, Starmer called for unity as the standards investigation loomed, reinforcing party cohesion and dampening speculation of a resignation.
Eastern Eye notes a public protest by the “Stop Trump Coalition” linking UK foreign policy to the Mandelson scandal, highlighting mounting public and intra‑party pressure on
May 15 rises to 17%3%
Eastern Eye notes a public protest by the “Stop Trump Coalition” linking UK foreign policy to the Mandelson scandal, highlighting mounting public and intra‑party pressure on Starmer
Parliament schedules vote on a possible Privileges Committee inquiry into whether Starmer misled the House over Peter Mandelson’s appointment
April 30 dips to 11%2%
Parliament schedules vote on a possible Privileges Committee inquiry into whether Starmer misled the House over Peter Mandelson’s appointment
Starmer repeats that “vast majority” of Labour MPs want him to stay on as prime minister in a Metro interview – The repeated claim of strong party support further eroded “Yes”
April 30 dips to 1%2%
Starmer repeats that “vast majority” of Labour MPs want him to stay on as prime minister in a Metro interview – The repeated claim of strong party support further eroded “Yes” sentiment, pushing the
Starmer begins three‑day strategic visit to China While intended to boost trade, the trip was framed by media as a distraction from the domestic crisis, and no new
April 30 dips to 2%2%
Starmer begins three‑day strategic visit to China While intended to boost trade, the trip was framed by media as a distraction from the domestic crisis, and no new leadership‑change narrative emerged, reinforcing market belief that Starmer would stay in office
Starmer survives Commons vote on Privileges Committee referral despite 15 Labour rebels voting against him – Labour MPs defied a three‑line whip and voted to refer Starmer to the
April 30 dips to 1%4%
Starmer survives Commons vote on Privileges Committee referral despite 15 Labour rebels voting against him – Labour MPs defied a three‑line whip and voted to refer Starmer to the Privileges Committee, but Downing Street’s heavy whipping forced the motion down, signalling that the government could still block an inquiry and keep Starmer in post.
New Statesman column reports a growing consensus among ministers that Starmer should set a timetable for an orderly transition following the imminent local‑election losses
May 15 dips to 16%1%
New Statesman column reports a growing consensus among ministers that Starmer should set a timetable for an orderly transition following the imminent local‑election losses
Ipsos poll shows half of Britons now think Starmer should step down, pushing “Yes” back up
June 30 surges to 42%19%
Ipsos poll shows half of Britons now think Starmer should step down, pushing “Yes” back up
The i Paper reveals secret cabinet discussions on who should tell Starmer to resign, with insiders saying the demand will likely be delivered after the 7 May local elections
May 15 dips to 16%2%
The i Paper reveals secret cabinet discussions on who should tell Starmer to resign, with insiders saying the demand will likely be delivered after the 7 May local elections
Labour MP Jonathan Brash publicly calls for Starmer’s resignation, prompting media focus on internal dissent – The fresh leadership‑challenge rumour caused a modest dip as traders
April 30 dips to 3%3%
Labour MP Jonathan Brash publicly calls for Starmer’s resignation, prompting media focus on internal dissent – The fresh leadership‑challenge rumour caused a modest dip as traders
Live‑blog of the PMQs where Starmer was criticised for sacking senior diplomat Olly Robbins and faced a “psychodrama” accusation, signalling deepening parliamentary unrest
May 15 jumps to 28%5%
Live‑blog of the PMQs where Starmer was criticised for sacking senior diplomat Olly Robbins and faced a “psychodrama” accusation, signalling deepening parliamentary unrest
Starmer sacks Foreign Office permanent secretary Sir Olly Robbins amid Mandelson vetting row The Prime Minister removed Robbins after it emerged the Foreign Office had over‑ruled
April 30 dips to 4%3%
Starmer sacks Foreign Office permanent secretary Sir Olly Robbins amid Mandelson vetting row The Prime Minister removed Robbins after it emerged the Foreign Office had over‑ruled the security‑vetting denial on Mandelson, intensifying the perception that Starmer’s government was mis‑managing senior appointments
Labour MP publicly calls for Starmer’s resignation, but party leadership backs him – The Guardian live‑blog noted a backbench MP urging Starmer to quit, yet highlighted that the
April 30 dips to 4%3%
Labour MP publicly calls for Starmer’s resignation, but party leadership backs him – The Guardian live‑blog noted a backbench MP urging Starmer to quit, yet highlighted that the majority of Labour MPs and senior ministers continued to publicly support him, signalling no coordinated move to remove him.
Labour MP Jonathan Brash publicly calls for Starmer’s resignation, reigniting speculation and lifting the
June 30 jumps to 46%8%
Labour MP Jonathan Brash publicly calls for Starmer’s resignation, reigniting speculation and lifting the
Scottish Labour leader Anas Sarwar calls for Starmer to quit;
June 30 drops to 42%13%
Guardian reports mounting pressure from within Labour
Starmer tells the Sunday Times the “vast majority” of Labour MPs still back him despite the Mandelson row – His public reassurance dampened speculation, pulling the
April 30 dips to 6%2%
Starmer tells the Sunday Times the “vast majority” of Labour MPs still back him despite the Mandelson row – His public reassurance dampened speculation, pulling the
Time magazine analysis: “Why Starmer is facing growing calls to resign” – highlights cumulative scandals
June 30 drops to 42%13%
The high‑profile international piece renewed public scrutiny, but the market softened as the deadline approached without a concrete resignation announcement.
| Telegraph reveals new evidence that Starmer misled Parliament over Mandelson’s vetting, reigniting resignation pressure |
June 30 drops to 38%8%
| Telegraph reveals new evidence that Starmer misled Parliament over Mandelson’s vetting, reigniting resignation pressure |
Report that senior Labour MPs and ministers are publicly urging Starmer to quit over the Peter Mandelson security‑vetting scandal
May 15 dips to 24%1%
Report that senior Labour MPs and ministers are publicly urging Starmer to quit over the Peter Mandelson security‑vetting scandal
Ipsos poll shows 50 % of Britons think Starmer should resign, up from earlier weeks – The surge in public calls for his departure lifted “Yes” odds after the poll was released,
April 30 jumps to 8%7%
Ipsos poll shows 50 % of Britons think Starmer should resign, up from earlier weeks – The surge in public calls for his departure lifted “Yes” odds after the poll was released, reflecting heightened perceived risk of a resignation announcement.
Starmer rejects resignation rumours amid Mandelson vetting row – Reuters reported the Prime Minister’s spokesperson saying Starmer had “no plans to resign” after new details about
April 30 dips to 7%2%
Starmer rejects resignation rumours amid Mandelson vetting row – Reuters reported the Prime Minister’s spokesperson saying Starmer had “no plans to resign” after new details about Peter Mandelson’s failed security vetting emerged, dampening speculation of an imminent exit.
Mandelson security‑vetting scandal erupts, prompting calls for Starmer’s resignation Reports revealed that Peter Mandelson had failed UK security vetting as early as January 2025,
April 30 drops to 2%10%
Mandelson security‑vetting scandal erupts, prompting calls for Starmer’s resignation Reports revealed that Peter Mandelson had failed UK security vetting as early as January 2025, contradicting Starmer’s earlier Commons statements and sparking intense pressure from opposition parties and Labour backbenchers
Starmer publicly declares he will “never walk away” after surviving a day of intense political pressure, which drives the
June 30 plunges to 38%18%
Starmer publicly declares he will “never walk away” after surviving a day of intense political pressure, which drives the
Financial Times reports former Downing Street chief Morgan McSweeney describes the Mandelson‑Epstein revelations as “a knife through my soul”, intensifying pressure on Starmer
June 30 rises to 48%4%
Financial Times reports former Downing Street chief Morgan McSweeney describes the Mandelson‑Epstein revelations as “a knife through my soul”, intensifying pressure on Starmer
| Starmer declares he is “not prepared to walk away” after the resignation of his chief adviser and mounting calls for his exit |
June 30 drops to 44%5%
| Starmer declares he is “not prepared to walk away” after the resignation of his chief adviser and mounting calls for his exit |
Olly Robbins resigns as Foreign Office Permanent Secretary, citing the Mandelson controversy, causing a sharp rise in “Yes” odds
June 30 jumps to 56%11%
Olly Robbins resigns as Foreign Office Permanent Secretary, citing the Mandelson controversy, causing a sharp rise in “Yes” odds
Olly Robbins testifies that Starmer misled Parliament about Mandelson’s vetting, prompting renewed resignation demands
June 30 jumps to 55%13%
Olly Robbins testifies that Starmer misled Parliament about Mandelson’s vetting, prompting renewed resignation demands
| BBC reports that senior civil servant Sir Chris Wormald is expected to resign, adding to the perception of a collapsing administration |
June 30 rises to 49%4%
| BBC reports that senior civil servant Sir Chris Wormald is expected to resign, adding to the perception of a collapsing administration |
Starmer announces a major defence‑spending increase funded by cuts to foreign aid, drawing criticism and a sharp rise in “Yes” odds
June 30 surges to 44%21%
Starmer announces a major defence‑spending increase funded by cuts to foreign aid, drawing criticism and a sharp rise in “Yes” odds
Prime Minister announces strengthening of ministerial code, giving independent adviser more powers
June 30 surges to 55%16%
The move was seen as a pre‑emptive step to address misconduct allegations, raising expectations of a possible resignation.
| Peter Mandelson is dismissed as US ambassador after emails linking him to Jeffrey Epstein are published | The removal of the scandal‑central figure revived doubts about
December 31 jumps to 66%8%
| Peter Mandelson is dismissed as US ambassador after emails linking him to Jeffrey Epstein are published | The removal of the scandal‑central figure revived doubts about Starmer’s judgment, sending the
Conservative MP Kemi Badenoch tables a parliamentary motion demanding Starmer’s resignation, pushing the
June 30 surges to 45%23%
Conservative MP Kemi Badenoch tables a parliamentary motion demanding Starmer’s resignation, pushing the
| Scottish Labour leader Anas Sarwar holds a press conference demanding Starmer step down |
June 30 surges to 45%22%
| Scottish Labour leader Anas Sarwar holds a press conference demanding Starmer step down |
| Scottish Labour leader Anas Sarwar holds a press conference calling for Starmer to quit, citing “appalling vacuum of leadership” | While a regional leader’s call added noise,
December 31 dips to 58%4%
| Scottish Labour leader Anas Sarwar holds a press conference calling for Starmer to quit, citing “appalling vacuum of leadership” | While a regional leader’s call added noise, the market briefly retreated as the story lost momentum. |
| Parliamentary Liaison Committee hearing reveals that Starmer misled MPs about Mandelson’s security clearance, with opposition demanding his resignation “by end of day” | Direct
December 31 rises to 62%3%
| Parliamentary Liaison Committee hearing reveals that Starmer misled MPs about Mandelson’s security clearance, with opposition demanding his resignation “by end of day” | Direct accusation of misleading Parliament intensified resignation pressure, lifting the
| BBC reports that Starmer’s approval rating has fallen to –46% in November, the lowest since his election, amid ongoing scandals | Deteriorating public support reinforced market
December 31 rises to 59%3%
| BBC reports that Starmer’s approval rating has fallen to –46% in November, the lowest since his election, amid ongoing scandals | Deteriorating public support reinforced market belief that Starmer’s tenure was untenable. |
Prime Minister Starmer announces a cabinet reshuffle, replacing several ministers who had resigned over the scandal, which pulls the “Yes”
June 30 jumps to 39%7%
Prime Minister Starmer announces a cabinet reshuffle, replacing several ministers who had resigned over the scandal, which pulls the “Yes”
Starmer announces a cabinet reshuffle, retaining key allies and calming the leadership crisis
June 30 plunges to 42%16%
Starmer announces a cabinet reshuffle, retaining key allies and calming the leadership crisis
Labour’s internal reshuffle after deputy Angela Rayner’s resignation;
June 30 jumps to 39%6%
Starmer sacks Peter Mandelson as ambassador, prompting a brief market rally
Starmer survives a confidence vote in the Commons; opposition fails to secure majority
June 30 jumps to 39%6%
Surviving the vote reassured some traders, nudging the
Starmer survives a parliamentary vote of confidence; opposition criticism eases
June 30 plunges to 58%15%
Starmer survives a parliamentary vote of confidence; opposition criticism eases
| Starmer survives a confidence vote after cabinet ministers publicly rally behind him |
June 30 plunges to 34%39%
| Starmer survives a confidence vote after cabinet ministers publicly rally behind him |
| Prime Minister Starmer is accused of “blatantly lying” about Mandelson’s security clearance;
June 30 surges to 73%40%
opposition leaders demand his resignation |
BBC live feed shows Labour backbench revolt;
June 30 surges to 73%27%
multiple MPs publicly demand Starmer’s resignation
Starmer’s net favourability hits historic lows in YouGov poll;
June 30 drops to 33%7%
opposition parties seize on the dip, raising speculation of a leadership challenge
Conservative leader Kemi Badenoch tables no‑confidence motion against Starmer
June 30 plunges to 33%15%
The formal parliamentary challenge pushed the market down as the likelihood of an immediate resignation seemed lower.
Olly Robbins sacked as Foreign Office top official after Mandelson vetting row
June 30 jumps to 48%10%
The dismissal was interpreted as the government attempting to contain the scandal, briefly reviving “Yes” odds.
Lord Mandelson is dismissed as ambassador after emails linking him to Jeffrey Epstein are published, temporarily easing pressure on Starmer
June 30 dips to 32%2%
Lord Mandelson is dismissed as ambassador after emails linking him to Jeffrey Epstein are published, temporarily easing pressure on Starmer
Starmer fires Mandelson after further Epstein‑link evidence surfaces, sparking calls for a no‑confidence vote
June 30 jumps to 46%8%
Starmer fires Mandelson after further Epstein‑link evidence surfaces, sparking calls for a no‑confidence vote
Starmer survives a Commons vote to block a Privileges Committee inquiry into Peter Mandelson’s vetting, bolstering his position
June 30 dips to 40%3%
Starmer survives a Commons vote to block a Privileges Committee inquiry into Peter Mandelson’s vetting, bolstering his position
Guardian investigation reveals Mandelson failed security vetting;
June 30 dips to 38%2%
Starmer says he was “staggered” not to have been told
Telegraph reports Starmer is the least‑popular UK prime minister on record, sparking fresh calls for his resignation
June 30 jumps to 43%8%
Telegraph reports Starmer is the least‑popular UK prime minister on record, sparking fresh calls for his resignation
Conservative leader Kemi Badenoch declares Starmer’s position “untenable” over the Mandelson vetting row
June 30 jumps to 40%5%
Conservative leader Kemi Badenoch declares Starmer’s position “untenable” over the Mandelson vetting row
Labour MP Jonathan Brash publicly urges Starmer to set a resignation timetable
June 30 plunges to 38%35%
Even though the call came from a backbencher, the public nature of the demand signalled internal dissent, causing a sharp correction.
BBC reports MP Jonathan Brash publicly calls for Starmer’s resignation, signalling growing internal dissent
June 30 rises to 35%2%
BBC reports MP Jonathan Brash publicly calls for Starmer’s resignation, signalling growing internal dissent
Ipsos poll finds 52 % of Britons say Starmer should stand down as PM
June 30 plunges to 35%16%
Ipsos poll finds 52 % of Britons say Starmer should stand down as PM
| Morgan McSweeney, Starmer’s chief of staff, appears before the Foreign Affairs Select Committee;
June 30 drops to 33%7%
his resignation is announced |
Prime Minister’s “unprecedented” resignation calls intensify after new evidence of Mandelson‑Epstein emails released
June 30 surges to 73%33%
The explosive email leak dramatically increased the perceived risk of Starmer being ousted, driving the
BBC reports that the opposition leader Kemi Badenoch declares Starmer’s position “untenable” and urges his resignation, driving the
June 30 plunges to 34%39%
BBC reports that the opposition leader Kemi Badenoch declares Starmer’s position “untenable” and urges his resignation, driving the
| Labour MP Jonathan Brash publicly calls for Starmer’s resignation, calling the government a “psychodrama” |
June 30 dips to 40%3%
| Labour MP Jonathan Brash publicly calls for Starmer’s resignation, calling the government a “psychodrama” |
Starmer asserts “full due process” during PMQs while opposition MPs demand his resignation over Mandelson scandal
June 30 dips to 40%3%
Starmer’s defence failed to quell criticism; the parliamentary showdown nudged the
Starmer tells MPs “full due process” was followed for Mandelson’s appointment, later contradicted by evidence
June 30 plunges to 33%15%
Starmer tells MPs “full due process” was followed for Mandelson’s appointment, later contradicted by evidence
Starmer tells MPs at PMQs that “full due process” was followed for Mandelson’s appointment, a claim later contradicted by leaked documents, sparking a surge in “Yes” odds
June 30 surges to 73%40%
Starmer tells MPs at PMQs that “full due process” was followed for Mandelson’s appointment, a claim later contradicted by leaked documents, sparking a surge in “Yes” odds
| Olly Robbins, top Foreign Office official, resigns amid Mandelson vetting row |
June 30 jumps to 43%8%
| Olly Robbins, top Foreign Office official, resigns amid Mandelson vetting row |
| Starmer sacks Ambassador‑designate Peter Mandelson after emails reveal a close relationship with Jeffrey Epstein |
June 30 plunges to 35%16%
| Starmer sacks Ambassador‑designate Peter Mandelson after emails reveal a close relationship with Jeffrey Epstein |
BBC reports that senior minister Anneliese Dodds resigns in protest over aid‑budget cuts, adding to the cumulative resignation tally
BBC reports that senior minister Anneliese Dodds resigns in protest over aid‑budget cuts, adding to the cumulative resignation tally
Labour’s internal poll shows 51 % of members now favour a leadership contest, reviving resignation speculation
December 31 jumps to 67%14%
Labour’s internal poll shows 51 % of members now favour a leadership contest, reviving resignation speculation
Anas Sarwar reiterates his resignation demand at a press conference, pushing the
December 31 surges to 67%15%
Anas Sarwar reiterates his resignation demand at a press conference, pushing the
Prime Minister’s Questions: Starmer refuses to “walk away,” but admits “political turmoil,” temporarily stabilising the market
December 31 drops to 53%14%
Prime Minister’s Questions: Starmer refuses to “walk away,” but admits “political turmoil,” temporarily stabilising the market
Starmer announces a cabinet reshuffle and retains backing from senior Labour figures, lifting the
December 31 jumps to 52%6%
Starmer announces a cabinet reshuffle and retains backing from senior Labour figures, lifting the
Former chief of staff Morgan McSweeney resigns over the Mandelson row, prompting a sharp drop
December 31 plunges to 46%19%
Former chief of staff Morgan McSweeney resigns over the Mandelson row, prompting a sharp drop
Kemi Badenoch (UK opposition leader) declares Starmer’s position “untenable” after the Mandelson fallout, pushing the
December 31 jumps to 67%14%
Kemi Badenoch (UK opposition leader) declares Starmer’s position “untenable” after the Mandelson fallout, pushing the
| Angela Rayner (Deputy Prime Minister) announces she will not stand for re‑election as deputy after a tax‑scandal inquiry, prompting a major cabinet reshuffle | Loss of the
December 31 rises to 73%4%
| Angela Rayner (Deputy Prime Minister) announces she will not stand for re‑election as deputy after a tax‑scandal inquiry, prompting a major cabinet reshuffle | Loss of the deputy heightened perception of a collapsing government, pushing the
BBC reports that senior Labour MPs (including Clive Lewis) publicly urge Starmer to step down, widening the leadership challenge narrative
December 31 jumps to 70%5%
BBC reports that senior Labour MPs (including Clive Lewis) publicly urge Starmer to step down, widening the leadership challenge narrative
Junior minister Josh Simons resigns despite being cleared, adding to the perception of a collapsing government
December 31 drops to 65%6%
Junior minister Josh Simons resigns despite being cleared, adding to the perception of a collapsing government
Scottish Labour leader Anas Sarwar publicly calls for Starmer’s resignation, prompting a brief market dip
December 31 drops to 65%6%
Scottish Labour leader Anas Sarwar publicly calls for Starmer’s resignation, prompting a brief market dip
Scottish Labour leader Anas Sarwar calls for Starmer to quit, sending the
December 31 jumps to 71%6%
Scottish Labour leader Anas Sarwar calls for Starmer to quit, sending the
Former Foreign Office chief Olly Robbins alleges “constant pressure” from No 10 to approve Mandelson’s appointment
June 30 jumps to 43%8%
Robbins’ testimony suggested the Prime Minister’s office had overridden security advice, reviving doubts about Starmer’s judgment and pushing the market back up.
| Labour MP Clive Lewis becomes the first MP to publicly call for Starmer’s resignation over the Mandelson affair | First MP‑level resignation call added credibility to the
December 31 dips to 69%2%
| Labour MP Clive Lewis becomes the first MP to publicly call for Starmer’s resignation over the Mandelson affair | First MP‑level resignation call added credibility to the crisis, sustaining high odds. |
Former senior civil servant Olly Robbins testifies that No 10 pressured the Foreign Office to approve Mandelson, intensifying calls for a no‑confidence vote
June 30 rises to 48%3%
Former senior civil servant Olly Robbins testifies that No 10 pressured the Foreign Office to approve Mandelson, intensifying calls for a no‑confidence vote
Foreign Office civil servant Sir Olly Robbins sacked over the Mandelson vetting scandal, intensifying pressure on Starmer
December 31 drops to 61%7%
Foreign Office civil servant Sir Olly Robbins sacked over the Mandelson vetting scandal, intensifying pressure on Starmer
Starmer’s undisclosed visit to Palantir’s Washington office later reported, raising fresh ministerial‑code breach accusations
December 31 jumps to 68%12%
Starmer’s undisclosed visit to Palantir’s Washington office later reported, raising fresh ministerial‑code breach accusations
Starmer appoints Peter Mandelson as U.S.
June 30 surges to 48%25%
ambassador despite pending security vetting
Starmer “furious” after learning Lord Peter Mandelson failed security vetting; Kemi Badenoch says his position “untenable”
June 30 plunges to 35%16%
The revelation that Mandelson’s appointment had been made despite a failed vetting check sparked immediate calls from the Conservative leader Kemi Badenoch for Starmer to resign, sending the “Yes” probability sharply lower.
Starmer “absolutely furious” after learning Peter Mandelson failed security vetting before his U.S. ambassadorship appointment
December 31 jumps to 56%5%
Starmer “absolutely furious” after learning Peter Mandelson failed security vetting before his U.S. ambassadorship appointment
Mandelson is formally appointed U.S.
June 30 jumps to 45%10%
ambassador despite the earlier vetting denial, prompting immediate calls from opposition MPs for Starmer’s resignation
| Morgan McSweeney (Starmer’s chief of staff) resigns, citing responsibility for the Mandelson appointment | The departure of a senior adviser signalled internal turmoil, nudging
December 31 rises to 71%3%
| Morgan McSweeney (Starmer’s chief of staff) resigns, citing responsibility for the Mandelson appointment | The departure of a senior adviser signalled internal turmoil, nudging the
Starmer survives a confidence vote in Parliament, temporarily stabilising the
December 31 jumps to 67%6%
Starmer survives a confidence vote in Parliament, temporarily stabilising the
Opposition leader Kemi Badenoch publicly demands Starmer’s resignation, pushing the market lower
December 31 drops to 61%7%
Opposition leader Kemi Badenoch publicly demands Starmer’s resignation, pushing the market lower
| Kemi Badenoch (Conservative leader) labels Starmer’s position “untenable” after the Mandelson scandal, calling for his immediate resignation | Opposition pressure reinforced
December 31 dips to 68%2%
| Kemi Badenoch (Conservative leader) labels Starmer’s position “untenable” after the Mandelson scandal, calling for his immediate resignation | Opposition pressure reinforced market expectations of a possible ouster, keeping the
Prime Minister’s furious response at a France summit, calling his own position “untenable” after the Mandelson revelations
December 31 drops to 68%9%
Prime Minister’s furious response at a France summit, calling his own position “untenable” after the Mandelson revelations
BBC reports Mandelson was appointed despite a “clearance denied” vetting recommendation, intensifying pressure on Starmer
December 31 surges to 77%15%
BBC reports Mandelson was appointed despite a “clearance denied” vetting recommendation, intensifying pressure on Starmer
| Prime Minister Keir Starmer publicly declares he was “staggered” to learn Mandelson failed vetting and vows to “walk away” from power if forced to resign | Starmer’s admission
December 31 jumps to 70%8%
| Prime Minister Keir Starmer publicly declares he was “staggered” to learn Mandelson failed vetting and vows to “walk away” from power if forced to resign | Starmer’s admission of being blindsided amplified speculation of a leadership crisis, driving the
Starmer says he was “staggered” to learn Lord Peter Mandelson failed security vetting, sparking fresh calls for his resignation
December 31 jumps to 62%11%
Starmer says he was “staggered” to learn Lord Peter Mandelson failed security vetting, sparking fresh calls for his resignation
UK Security Vetting rejects Peter Mandelson’s clearance for the U.S.
June 30 jumps to 35%5%
ambassadorship, but the Foreign Office later over‑rules the decision
| Olly Robbins (top Foreign Office civil servant) testifies that No 10 pressured the department to approve Peter Mandelson’s US‑ambassador appointment despite failed security
December 31 jumps to 55%7%
| Olly Robbins (top Foreign Office civil servant) testifies that No 10 pressured the department to approve Peter Mandelson’s US‑ambassador appointment despite failed security vetting | Revelation of direct No 10 interference raised doubts about Starmer’s control, lifting “Yes” odds. |
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