The UK government has unveiled a £15 billion Defence Investment Plan (DIP) aimed at bolstering military capabilities amid rising global tensions, with outgoing Prime Minister Sir Keir Starmer emphasizing the need to prepare for potential future conflicts. Unveiled in early July 2026, the plan outlines a significant increase in defence spending, raising annual expenditure from £54 billion when Labour took office to an anticipated £80 billion by 2029.

Sir Keir framed the DIP as essential to deterring adversaries by showing military strength, asserting that “the best way to avoid war is to prepare for it.” The plan, which was originally expected to be published last year following the Strategic Defence Review, had been repeatedly delayed due to disagreements within government over funding. Ultimately, some road and energy infrastructure projects were cut to reallocate capital budgets toward defence, although officials stressed that day-to-day spending on frontline services such as health and education would remain unaffected.

Chancellor Rachel Reeves acknowledged that only about two-thirds (£10.3 billion) of the funding had been officially identified, with the remaining £4.7 billion to be confirmed at Budget 2026. This unresolved portion leaves the next prime minister, expected to be Andy Burnham, responsible for securing the final funding. In response, analysts warn that the new administration will face difficult decisions, potentially including further cuts or increased borrowing.

The DIP allocates sizeable funds toward modernising capabilities, highlighting a £5 billion investment in a “drone transformation” to develop unmanned platforms across land, sea, and air forces. Additional funding includes nearly £64 billion toward renewing the UK’s nuclear deterrent, more than £8 billion for the Global Combat Air Programme with Japan and Italy, and £11 billion for munitions stockpiles. However, this focus on emerging technologies and long-term projects has raised concerns among military experts about preparedness for near-term threats, particularly from Russia, which NATO has warned could pose a direct risk by 2030.

Former Defence Secretary John Healey resigned earlier in the month, citing frustration with the government’s refusal to commit adequate resources. He welcomed the increase over earlier proposals but argued the plan remains underfunded and lacks a credible pathway to meet NATO’s commitment to spend 3.5% of GDP on defence by 2035. Critics, including Tan Dhesi, chair of the Commons Defence Committee, echoed these concerns, calling the plan disappointing for its failure to outline how the UK would achieve NATO spending targets amid a rising threat environment.

The DIP has attracted criticism from multiple quarters. Some Conservative MPs have argued the plan is insufficient, contending that savings should be made by cutting welfare spending rather than repurposing funds from other departments. Opposition voices have also highlighted major cuts within the plan, including the scrapping of military satellites, certain missile defence systems, warships, and special forces aircraft. The Ministry of Defence has been tasked with finding more than £10 billion in efficiency savings, encompassing personnel reductions, infrastructure cuts, and procurement reforms.

Defence analysts warn that the UK’s projected defence spending of 2.7% of GDP by 2029-30, while a substantial increase, positions the country behind several NATO allies and falls short of the 5% target advocated by some international figures. Experts caution that current investments overlook key conventional capabilities needed to counter near-term threats. There is also concern over the UK’s shrinking naval fleet and delayed delivery of new technologies amid growing geopolitical challenges.

Sir Keir, whose premiership is set to conclude within weeks, expressed confidence that his successor will build upon the plan’s foundation. Nonetheless, observers note that the DIP will be a defining test for Andy Burnham’s incoming administration, which must decide whether to adhere to the investment trajectory or pursue more ambitious defence spending amid competing fiscal pressures.

NATO Secretary General Mark Rutte welcomed the plan as a positive step toward alliance defence commitments. However, some military figures and security experts emphasize that further, more robust action is needed to ensure the UK’s armed forces are adequately prepared in a rapidly evolving strategic landscape.