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Starmer Steps Down: What Labour’s Power Shift Means for Investors

  • Jun 23
  • 5 min read

Keir Starmer’s decision to step down as Prime Minister has triggered a Labour leadership race and introduced a fresh layer of uncertainty for UK markets. The move follows weak local election results, falling poll ratings, and growing pressure within his own party.


Who is likely to take over?


At present, Andy Burnham appears to be the clear frontrunner. His recent by-election win, and relatively strong popularity with Labour voters, has put him ahead of his party rivals. Forecasts and political betting markets suggest he is likely to win, especially as other potential contenders, such as Wes Streeting, have indicated support rather than opposition.


However, other names still matter for investors, particularly because they represent different economic approaches:


  • Angela Rayner is often seen as more firmly left-leaning. A leadership under Rayner could lean more heavily towards worker protections, redistribution, and public sector spending. For markets, that could mean stronger support for public services and wages, but also greater concern around higher taxation and borrowing.


  • Al Carns, while less widely known, has been associated with defence and public spending debates. A Carns leadership could place more emphasis on government investment, particularly in defence and national resilience. This might support certain sectors, such as industrials and defence, but could also raise questions around fiscal discipline if spending increases are not matched by credible funding plans.


  • Ed Miliband would represent a return to a more established Labour figure, with a strong focus on climate policy and structural economic reform. His leadership could accelerate investment in energy transition, renewables, and green infrastructure. This may benefit specific sectors but could also introduce regulatory changes and policy risk for high carbon industries, and some corporates.


While these candidates are less likely than Burnham at present, their policy direction provides a useful guide to the range of outcomes markets are considering.




Why it matters for investors.


For investors, the key issue is not just who wins, but what policies follow.


Starmer’s government broadly focused on fiscal discipline, even where that meant higher taxes to steady the public finances. Burnham, by contrast, is often seen as more left leaning, with greater emphasis on public investment, regional growth, and support for domestic industries.


That shift could have several implications:

  • UK equities:

    Increased public spending could support areas like infrastructure, energy, and domestic industries, while higher taxation could weigh on corporate profits more broadly, particularly among larger companies.

  • UK bonds, or gilts:

    If markets expect higher borrowing, gilt yields (borrowing costs) may rise, meaning bond values fall, as investors demand greater compensation for risk. The UK’s borrowing costs are already sensitive to fiscal credibility, and supply dynamics, with borrowing costs having risen to their highest levels in nearly 30 years at the long end of the gilt market.

  • Sterling:

    Political uncertainty often puts short term pressure on the pound. A clear, and credible, fiscal plan could stabilise it, while policy surprises could increase volatility.



What does this mean for consumers?


For households, the impact depends on how any new policies are funded and implemented.

  • Higher public spending could support jobs, and services, in the short term

  • Higher government borrowing risks pushing up interest rates, affecting mortgages, and loans

  • Higher taxes could indirectly reduce disposable income



The bottom line?


Starmer’s resignation marks more than a political shift, it introduces the potential for a change in economic direction.


If the next leader, combines increased investment with credible fiscal discipline, markets may remain relatively stable. However, if investors become concerned about rising borrowing or taxation, or unclear policy direction, which could lead to higher bond yields, a weaker pound, less disposable income for consumers and more volatility across UK assets.

For retail investors, the key is to focus less on the headlines, and more on the detail, specifically how future spending, taxation, and borrowing plans are structured.



What This Means for Clever Portfolios.


At Clever, portfolio construction does not depend on predicting who will become Prime Minister or reacting to every political headline.


Clever portfolios are diversified across asset classes, geographic regions and market sectors. This helps reduce reliance on any single country, company, currency, industry or political outcome. UK developments may affect gilts, sterling and domestically focused businesses, but globally diversified portfolios are also influenced by markets across the United States, Europe, Asia and emerging economies.


Our investment approach is also rules-based. Portfolio decisions are guided by a consistent and disciplined framework rather than emotion, political opinion or short-term speculation.


A leadership change alone would not necessarily justify altering a portfolio. Instead, we assess whether political developments create material and persistent changes in financial markets. These could include significant movements in interest rates, inflation expectations, currencies, credit conditions, volatility, asset valuations or the relationships between different investments.


Clever portfolios are designed to remain diversified and disciplined while being ready to respond when market evidence indicates that risks or opportunities have materially changed.


No investment process can eliminate risk, and diversification cannot guarantee against losses. However, a diversified, rules-based approach can help investors navigate political and economic uncertainty without allowing any single event to determine their long-term financial outcome.



This article is provided for general information only and does not constitute personal financial advice. Investments can fall as well as rise, and investors may receive back less than they originally invested.


Author.

Anthony Walters, Co-CIO and Head of ESG at CleverIM.

Sources.

UK PM Starmer resigns as Britain faces its seventh leader in 10 years, Hugh Leask, CNBC, 22 June 2026

Starmer announces he will resign as UK prime minister with Burnham confirming bid to succeed him, Associated Press, WTOP News, 22 June 2026

Keir Starmer Announces He will Resign as UK Prime Minister Kicking off Contest for Labour Successor, Associated Press, US News, 22 June 2026

UK’s Starmer considers political future could decide as soon as Monday, Elizabeth Piper and David Milliken, Reuters, 21 June 2026

Makerfield by election results 2026 Andy Burnham win piles pressure on Keir Starmer, Express Global Desk, Indian Express citing Reuters, 19 June 2026

Political favourability ratings May 2026, YouGov, YouGov, 14 May 2026

Who is leading the race to replace Sir Keir Starmer, The Economist, The Economist, 19 June 2026

2026 Labour Party leadership election, Various contributors, Wikipedia, last updated 2026

2026 Labour Party leadership crisis, Various contributors, Wikipedia, last updated 2026

What the UK Budget Means for Its Bond and Stock Markets, Goldman Sachs Research, Goldman Sachs, 2 December 2025

The Budget and bond markets when you are in a hole stop digging, Moyeen Islam, Institute for Fiscal Studies, 16 October 2025

UK Budget November 2025 its impact on the UK economy markets and borrowing costs, David Rees, Schroders, 25 November 2025

UK Economy trending news latest updates analysis, Bloomberg, Bloomberg, June 2026 Image https://members.parliament.uk/


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