Short Answer

Both the model and the market overwhelmingly agree that Reform is most likely, with only minor residual uncertainty.

1. Executive Verdict

  • Mandelson security vetting scandal provides a major political attack point.
  • Pre-PMQs headlines featured a significant 'sleaze' political scandal.
  • Keir Starmer recently prioritized addressing shoplifting in communications.
  • Public concern for crime notably increased, becoming a top national issue.
  • Labour MPs are coordinating questions for the upcoming PMQs session.

Who Wins and Why

Outcome Market Model Why
Trump 40.0% 24.3% Keir Starmer might refer to Donald Trump regarding international politics or recent global events.
King 45.0% 26.6% Keir Starmer may mention the King in relation to a recent event or constitutional matter.
Oil 54.0% 35.9% Discussions about energy policy or the cost of living frequently involve references to oil prices.
NHS / Healthcare 86.0% 79.9% The state of the NHS is a dominant issue in UK public and political discourse.
Ceasefire 27.0% 11.0% Calls for a ceasefire in international conflicts remain a key topic in foreign policy debates.

2. Market Behavior & Price Dynamics

Historical Price (Probability)

Outcome probability
Date
This market has experienced a significant upward trend, characterized by a major price spike. Initially priced at a low probability of 8.0%, the market saw a dramatic 27 percentage point increase to a peak of 35.0% between April 22 and April 25. Since reaching this high, the price has pulled back to its current level of 26.0%. Given that no specific external news or context was provided, the precise real-world catalyst for this sharp re-evaluation of probability is not identifiable from the data alone. However, the movement itself indicates that a significant event or piece of information led traders to rapidly increase their expectation that Keir Starmer will mention the subject in question.
The price action has established clear technical levels and reveals shifting market conviction. The all-time high of 35.0% now serves as a key resistance level, which the market has thus far failed to sustain. The initial price of 8.0% acts as historical support. Volume patterns are particularly insightful; while total volume is moderate at 1,269 contracts, a substantial portion of that trading occurred recently around the current 26.0% level. This high volume during the price pullback suggests significant activity, possibly from traders taking profits after the spike or new traders establishing positions, indicating that the 26.0% mark is an important area of price discovery. Overall market sentiment has clearly shifted from viewing the event as highly unlikely to moderately possible, though the recent pullback from the peak shows some emerging uncertainty or belief that the initial rally was overextended.

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

Outcome: Iran

📉 April 27, 2026: 15.0pp drop

Price decreased from 85.0% to 70.0%

What happened: No supporting research available for this anomaly.

📈 April 25, 2026: 23.0pp spike

Price increased from 62.0% to 85.0%

What happened: No supporting research available for this anomaly.

📈 April 23, 2026: 10.0pp spike

Price increased from 55.0% to 65.0%

What happened: No supporting research available for this anomaly.

Outcome: Trump

📈 April 26, 2026: 12.0pp spike

Price increased from 22.0% to 34.0%

What happened: No supporting research available for this anomaly.

Outcome: NATO

📈 April 22, 2026: 27.0pp spike

Price increased from 8.0% to 35.0%

What happened: No supporting research available for this anomaly.

4. Market Data

View on Kalshi →

Contract Snapshot

This market resolves to Yes if Keir Starmer says "Oil" (including plural or possessive forms) in an official capacity during the next Prime Minister's Questions (UK House of Commons) after April 22nd, 2026 at 1:00 PM ET. Otherwise, it resolves to No. Resolution is primarily based on video of the event, with transcripts used if consensus cannot be reached, and the market closes after the outcome or by May 14, 2026, at 10:00 AM EDT if the event hasn't occurred.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Reform $0.91 $0.14 91%
NHS / Healthcare $0.91 $0.13 86%
Defense / Defence $0.82 $0.24 81%
Iran $0.78 $0.30 76%
Oil $0.54 $0.47 54%
King $0.50 $0.58 45%
Trump $0.39 $0.64 40%
Afford / Affordable / Affordability $0.34 $0.69 35%
Ukraine $0.35 $0.69 35%
Ceasefire $0.27 $0.74 27%
NATO $0.28 $0.77 26%
Israel / Israeli $0.19 $0.84 20%
Blockade $0.14 $0.89 14%
Immigrant / Immigration $0.09 $0.93 10%
Epstein $0.09 $0.94 9%

Market Discussion

Limited public discussion available for this market.

5. What UK Political Scandals Dominated Pre-PMQs Headlines?

Prime Minister's Key IssueEfforts to block a 'sleaze vote' [^]
Opposition Leader's ChallengeKeir Starmer's backbench rebellion concerning 'Mandelson affair' [^]
Prominent Newspaper Headline'PM battles to block sleaze vote' [^]
In the 48 hours preceding Prime Minister's Questions, a significant political issue dominating the front pages of major UK newspapers was a 'sleaze vote' involving the Prime Minister. Headlines prominently featured the narrative of 'PM battles to block sleaze vote,' indicating widespread coverage and the importance of this issue across various publications [^].
Concurrently, Keir Starmer faced a significant backbench rebellion over the Mandelson affair. The Times reported that Starmer was experiencing dissent specifically related to the 'Mandelson affair' [^]. Although this was featured as a comment or view article, a party leader confronting internal dissent over a notable political affair would undoubtedly be a critical story garnering significant attention before Prime Minister's Questions [^].

6. What Political Impact Does the Mandelson Vetting Scandal Have?

Mandelson Vetting StatusFailed security vetting process [^]
Keir Starmer's ClaimOfficials deliberately withheld vetting results from him [^]
Political FalloutForeign Office chief sacked; Opposition accuses Starmer of cover-up [^]
The Mandelson security vetting scandal emerged as a major political development. The primary subject creating an immediate point of attack for the Opposition in the past week has been the unfolding scandal surrounding the security vetting of Peter Mandelson [^]. Reports indicate that Peter Mandelson failed a security vetting process [^]. Keir Starmer has publicly stated that officials deliberately withheld the result of this vetting from him [^].
This scandal triggered significant political fallout and opposition scrutiny. The situation has led to considerable political consequences, including the sacking of a Foreign Office chief [^]. The Opposition has quickly seized upon this, with Kemi Badenoch accusing Keir Starmer of "sacking everyone to cover for himself" and demanding that "the truth must come out!" [^]. While No. 10 has denied that Starmer was aware Mandelson had failed security vetting [^], the controversy has generated intense scrutiny and a direct line of attack for the Opposition against Starmer, particularly regarding issues of accountability and transparency [^].

7. What Is Keir Starmer's Recent Strategic Focus on Shoplifting?

Primary Strategic FocusShoplifting crackdown [^]
Starmer's Core PledgeEnd "free-for-all" on shop theft [^]
Police Efforts Status"Turning the tide" against shoplifting [^]
Keir Starmer and the Shadow Cabinet prioritized shoplifting in recent communications. Over the last five days, addressing shoplifting has been a central and strategic theme in their official press releases and social media output [^]. Starmer publicly pledged to end the "disgraceful" free-for-all of shop theft, promising a rigorous crackdown on this form of crime [^]. This concerted effort aims to restore respect for shopworkers and demonstrate Labour's commitment to law and order and community safety [^].
Starmer emphasized police successes in combating retail crime. He highlighted police efforts, stating that forces are "turning the tide" against shoplifting and citing impactful letters to underscore the seriousness of the issue [^]. This proactive stance on community safety clearly contrasts with other challenges, such as a potential parliamentary probe into Starmer's role in Peter Mandelson's vetting, which has been managed as a defensive political matter rather than a proactive communication theme [^]. The explicit policy announcements regarding shoplifting align with a clear, pre-planned agenda for public engagement [^].

8. How Has Concern for Crime Increased Among British Voters?

Increase in Concern for Crime12 percentage points (January to October 2023) [^]
Crime's Ranking Among ConcernsSecond most pressing issue (behind the economy) [^]
Britons Citing Crime as Major Issue24% by October 2023 (up from 12% in January) [^]
Concern for crime has notably increased, becoming a top national issue. According to YouGov's 'Most Important Issues' tracker, crime registered the largest percentage point increase among voters, climbing by 12 points from January to October 2023 [^]. This substantial rise elevated crime to become the second most pressing concern for Britons, trailing only the economy [^].
Public concern for crime doubled, signifying a major shift in priorities. The percentage of Britons identifying crime as a major issue doubled during 2023, rising from 12% in January to 24% by October [^]. This increase indicates a notable shift in public sentiment, with nearly a quarter of Britons now viewing crime as a primary national concern [^].

9. Were Labour MPs' Questions Coordinated for PMQs on 29 April 2026?

PMQs DateWednesday 29 April 2026 [^]
Order Paper AvailabilityContent of Commons business papers for 29 April 2026 not provided [^]
Coordinated QuestionsCannot be determined due to lack of specific question content [^]
Prime Minister's Questions is scheduled for Wednesday 29 April 2026. This parliamentary session is confirmed by several sources [^], with further listings also acknowledging the event [^]. General procedural information regarding Prime Minister's Questions (PMQs) is readily available [^], outlining the standard conduct and structure of these sessions.
Critical information on tabled questions was not available. To determine if there was a coordinated cluster of questions from Labour backbench MPs for this specific session, access to the House of Commons Order Paper or business papers for April 29, 2026, is essential [^]. The provided research results did not include the specific content of these papers, meaning the actual questions tabled by individual Members of Parliament could not be reviewed.
Without specific questions, a coordinated strategy cannot be identified. The absence of the detailed content from the Order Paper prevents the identification of any thematic lines of inquiry or a coordinated strategy from Labour backbench MPs. While the scheduling and general procedure of PMQs are confirmed, these details do not provide the specific content required to answer the query regarding coordinated questions [^].

10. What Could Change the Odds

Key Catalysts

Catalyst analysis unavailable.

Key Dates & Catalysts

  • Expiration: May 14, 2026
  • Closes: May 14, 2026

11. Decision-Flipping Events

  • Trigger: Catalyst analysis unavailable.

13. Historical Resolutions

Historical Resolutions: 20 markets in this series

Outcomes: 5 resolved YES, 15 resolved NO

Recent resolutions:

  • KXSTARMERMENTIONB-26APR22-UKRA: NO (Apr 22, 2026)
  • KXSTARMERMENTIONB-26APR22-TRUM: NO (Apr 22, 2026)
  • KXSTARMERMENTIONB-26APR22-REFO: YES (Apr 22, 2026)
  • KXSTARMERMENTIONB-26APR22-OIL: NO (Apr 22, 2026)
  • KXSTARMERMENTIONB-26APR22-NUCL: NO (Apr 22, 2026)