The United Kingdom has announced a £15 billion increase in its planned defence budget over the next four years, aiming to bolster military capabilities amid evolving global threats. However, experts caution that much of the planned modernisation will not materialize until the 2030s, leaving the country potentially underprepared for near-term challenges, particularly from Russia.

Prime Minister Sir Keir Starmer unveiled the defence investment plan (DIP) on April 25, 2024, outlining a pathway for military spending to reach 2.7 percent of GDP by 2030. This is below the levels recommended by some defence officials and far less than spending commitments of comparable European nations such as Germany, which is projected to reach 3.7 percent by 2030, and Poland at 4.8 percent. John Healey, who resigned as defence secretary last month, previously advocated for spending to reach 3 percent by 2030.

Prominent defence figures underline concerns about the timeline and scale of the investments. Sir Richard Barrons, former commander of the Joint Forces Command and co-author of the 2025 Strategic Defence Review, noted that much of the new funding targets long-term projects like the Global Combat Air Programme (GCAP) fighter jets and the Aukus nuclear-powered attack submarines. These are not expected to be operational until the mid-to-late 2030s, potentially leaving the UK ill-equipped to confront imminent threats. Barrons stressed, “If your problem is three years away and your solution is 10 years off, how does that work?” referencing concerns about Russia’s perceived risk to NATO by 2030, a threat acknowledged by Starmer himself.

Former Royal Navy head Admiral Lord Alan West echoed these views, criticizing the government for not committing to a 3 percent GDP defence spending target by 2030. He emphasized the necessity of immediate investment, rather than focusing primarily on capital projects to be delivered a decade from now. Labour’s Tan Dhesi, chair of the Commons defence committee, pressed for a clear timeline to reach higher spending, citing the same security concerns.

Defence Secretary Dan Jarvis defended the plan, stating that he had secured agreement from other government departments to reallocate 1 percent of their capital budgets toward the £15 billion increase. He noted cuts to other domestic projects, including infrastructure and energy, to free up funds for defence. Senior defence officials highlighted an increase in funding for training, operations, and estate management, with the Resource Departmental Expenditure Limit (RDEL) set at £41.7 billion for 2026-27.

The investment plan allocates £8.6 billion to the GCAP fighter jet programme, developed cooperatively with Italy and Japan, an increase of roughly £2 billion from informal estimates. Submarine construction dominates the spending, with £47 billion earmarked over four years to develop 12 nuclear-powered attack submarines in partnership with Australia; construction is slated to begin next year. Additionally, more than £5 billion has been designated for a "drone transformation" initiative, focusing on uncrewed and autonomous systems inspired by lessons from the Ukraine conflict.

Several procurement programmes were cut or altered, including cancellations of the Type 83 destroyers and Type 32 frigates in favor of hybrid Common Combat Vessels. Other scrapped projects include the Shadow R1 surveillance aircraft, Sky Wildcat reconnaissance helicopters, and the SkyNet 6 satellite system. Defence procurement minister Luke Pollard described the cancelled projects as “CGIs,” shorthand for unfunded paper projects, stating, “I can’t field a CGI against Putin.”

The DIP also signals a shift toward a new generation of low-cost cruise missiles and the development of the Stratus missile system, though detailed timelines and contract awards remain unspecified. Experts caution that translating the plan’s priorities into actionable procurement will be critical.

Jarvis also announced a planned 15 percent reduction in civil service staff within the Ministry of Defence. While the plan has faced criticism for its pace and scale, some lawmakers, including Matt Western, chair of the Joint Committee on the National Security Strategy, welcomed the increased focus on the Royal Navy’s hybrid capabilities, recognizing an adaptation to emerging maritime security threats.