UK Prime Minister Keir Starmer said on Monday he will resign — pledging to ensure an orderly transfer of power to a new UK leader by September at the latest in an effort to avoid political instability.
A new Prime Minister would be the UK’s seventh leader since England and Wales voted to take the UK out of the European Union 10 years ago. Scotland voted to remain in the EU.
Starmer said he had listened to Labour Party colleagues and realised that he is no longer the individual who should lead it into a UK election due in 2029.
Starmer said he would ask the Labour Party’s organising committee to set out a timeline for a leadership contest.
Nominations will open on July 9 and if there is a contest, a new leader will be in place by September.
Starmer did not mention Andy Burnham, expected to be a leading candidate.
If other candidates decide to enter any leadership contest, the Labour Party could face a divisive fight that could paralyse the UK government.
Starmer said: “The question my party is asking now is whether I am best placed to lead us into the next general election. I have heard the answer from my parliamentary party to that question and I accept that answer with good grace.”
A new UK leader will inherit the same financial problems faced by Starmer — dominated by bond market investors opposed to any additional UK borrowing.
The UK already has the highest borrowing costs in the Group of Seven nations due to its high debt and interest payments.
The UK’s public sector net debt excluding public sector banks (PSND-ex) has reached £2.984 trillion. UK public sector net debt was provisionally estimated at 95.1% of GDP at the end of May 2026 — levels last seen in the early 1960s.
REACTION:
Susannah Streeter, Chief Investment Strategist, Wealth Club: “Andy Burnham looks set to become Britain’s seventh Prime Minister in around a decade, a remarkable level of political upheaval for a developed economy. Combined with the lingering effects of Brexit, the revolving door at Number 10 has tarnished the UK’s reputation as a stable place to do business and made it harder to attract the long-term investment needed to drive stronger economic growth.
“His resignation has kicked off another round of speculation about the direction of policy ahead. The pound is languishing at multi-month lows, borrowing costs remain highly elevated, and the domestically focused FTSE 250 has sunk further into the red. While some uncertainty may be easing as Burnham’s path to Number 10 appears increasingly clear, he’s an unproven economic force and so uneasiness looks set to linger.
“Andy Burnham has tried to reassure markets by signalling that he will largely stick to fiscal rules and take a more cautious approach to spending. He also appears willing to tackle the UK’s large benefits bill, arguing that welfare reform should focus on helping more people into work. Investors will also be scrutinising how Burnham’s interventionist instincts translate into national economic policy.
“He has argued that the government should play a more active role in shaping economic outcomes, particularly through greater investment in regions outside London and the South East. He is also expected to push for further devolution of economic powers and has indicated support for a stronger public role in key sectors and infrastructure. However, concerns are bubbling that greater state involvement could deter private investment if it creates additional costs or regulatory burdens.
“The latest government borrowing snapshot highlights the tricky fiscal backdrop he inherits. UK borrowing increased in May by almost a third compared with the same month last year. It underlines the need to keep bond markets on side and demonstrate that policies are aimed at bringing down long-term borrowing, alongside credible plans for reviving growth.
“The economy is in desperate need of fresh investment to improve productivity, stimulate business activity and raise living standards. Targeted investment, particularly in infrastructure, innovation, skills and fast-growing companies, will be crucial if the UK is to break out of its sluggish growth cycle.
“The recent House of Commons report on investing in the UK highlighted concerns that the country is not doing enough to channel capital towards domestic growth companies. Creating stronger incentives for investors to back innovative UK firms could become an increasingly important part of any strategy aimed at reviving economic growth, boosting productivity and improving the country’s long-term competitiveness …
“Ultimately, Burnham’s challenge will be convincing investors that a more interventionist approach can sit alongside more discipline with spending and pro-growth policies. After years of political chop and change, investors are likely to place a premium on stability, credibility and a clear long-term economic strategy.”
Richard Carter, head of fixed interest research at Quilter Cheviot: “The revolving door of UK Prime Ministers is spinning once again, with Keir Starmer lasting just short of two years in the job. It is now expected that Andy Burham will be coronated by the Labour Party as its next leader and consequently as UK Prime Minister, although Starmer will continue to allow for an orderly transition.
“What will be interesting to watch from here is the extent that the party has a leadership contest, or whether it is considered a one-horse race and thus everyone steps aside.
“Markets are wary of Burnham’s previous policy positions so they would prefer to see ideas for governing fleshed out via a leadership contest, keeping surprises to a minimum. There are difficult decisions around welfare and defence spending lurking, with each likely to have an impact on gilts and wider UK markets.
“For now, given the economic team Burham has been putting in place, alongside the fact he does not appear to be seeking a new mandate, we are probably going to see more of a continuation of the current direction from the government. Cabinet appointees will likely be scrutinised, however, for their growth friendly credentials.
“Last week’s borrowing figures highlight just how messy this inheritance will be, and as such, there is unlikely to be any immediate silver bullet to the UK’s economic woes. Without that new mandate, there is likely to be more tinkering with personal taxation around the edges and as such that will weigh on growth.
“Gilt yields have crept up in recent days as the political picture resolves itself. With UK still at a yield premium to developed market peers, investors and markets will want to see a credible economic plan that can help ignite growth and put the public finances back onto surer footing.”
Julia Specht, Assistant Vice President, Global Sovereign Ratings, Morningstar: “While we expect some near-term political uncertainty as a new leader and cabinet are selected, the UK’s strong institutions and established governance framework support a well-managed leadership transition.
“The future direction of the UK’s credit quality, in our view, will depend on the country’s medium-term economic and fiscal policy trajectory.”