Keir Starmer has appointed former Prime Minister Gordon Brown as the Prime Minister’s Special Reviewer on Global Finance and Cooperation, in a move that gives the brief a heavier economic and diplomatic weight than the title might first suggest. According to the government announcement, Brown will advise on how stronger global financial cooperation can help build a more secure and resilient Britain. That places the role well beyond ceremony. It ties foreign policy, investment and national preparedness into one piece of work.

The timing matters. The UK is preparing to take on the G20 presidency, and Downing Street appears keen to show that Britain wants to shape the discussion rather than simply attend it. For markets, that matters because global finance cooperation is no longer only about summit statements and institutional diplomacy. It is increasingly about who can attract long-term capital into defence, infrastructure, energy security and the systems that keep an economy working under pressure.

Brown has been asked to develop new international finance partnerships that can support defence and security-related investment, including measures that reinforce the UK’s relationship with Europe. That is a practical brief. It suggests the government wants new ways of bringing together states, institutions and private investors around projects that are strategic but not always easy to finance. Put simply, No 10 is looking for more money, from more partners, on terms that fit Britain’s wider security goals.

The government said Brown will engage with international leaders, finance institutions and private finance partners to help establish multilateral finance mechanisms. The wording is technical, but the idea is clear enough: shared pools of capital can make large cross-border projects more credible and reduce risk for private investors. If that approach works, it could open funding routes for everything from defence supply chains to critical infrastructure and industrial capacity. For UK businesses, especially firms linked to public contracts or export markets, that would be more than a diplomatic exercise.

Brown’s selection is also easy to understand. He was Britain’s longest-serving modern Chancellor and, as Prime Minister, worked with international counterparts during the global financial crisis. In April 2009, he hosted the G20 summit in London, where leaders pledged an extra $1.1 trillion to support the world economy, restore credit and protect jobs. That history gives him a credibility that few former British ministers can match in rooms where finance and politics meet. Starmer appears to be drawing on that network and experience as he looks for a bigger UK voice in international capital flows.

There is also a domestic reading. Households and smaller firms may not follow the language of multilateral finance closely, but they do feel the results when investment slows, supply chains weaken or governments are forced to choose between resilience and affordability. Brown will report directly to the Prime Minister, and the role is unpaid and part-time. The real test now is whether the review produces concrete finance partnerships rather than warm words. If it does, this appointment may come to be seen as an early sign that the government views economic security as something that has to be financed, not simply promised.