LONDON – Keir Starmer has announced a £298bn defence investment plan (Dip) that leaves a £4.7bn funding gap for his likely successor, Andy Burnham, to resolve in his first budget.
The plan aims to drive a “generational transformation” of the UK armed forces, but Treasury figures confirm that nearly a third of the immediate requirements remain unfunded.
The financial shortfall has sparked internal government unrest and accusations from political opponents that the outgoing prime minister has left a fiscal “black hole” for the incoming administration to fix.
The Funding Gap and Fiscal Risks
Sources close to the Makerfield MP stated that Burnham will not attempt to renegotiate the Dip following Starmer’s announcement at a press conference on Tuesday, arguing that unpicking it would damage confidence in Britain’s long-term defence posture.
Allies of Burnham have described the missing £4.7bn as an “unexploded bomb,” with some claiming the MP was not informed of the deficit during his initial briefings on the plan and warning that it could constrain wider domestic spending priorities in his first year in office.
The Conservative Party characterized the funding gap as a “delayed-action poison pill” for the future prime minister, accusing Labour of breaching its own fiscal discipline pledges.
A Treasury source defended the move, stating it is normal for a chancellor to make spending announcements with funds to be identified at the next fiscal event. The source suggested that Burnham and his chancellor could utilize approximately £24bn of “headroom” against fiscal rules identified during the spring statement, referring to space under the government’s self-imposed targets for borrowing and debt as set out in the Charter for Budget Responsibility.
However, this approach risks increasing the cost of government borrowing and squeezing future room for manoeuvre on tax and day-to-day public services. Starmer specifically warned against the issuance of “defence bonds,” stating:
“Defence bonds are just borrowing by another name. We’ve looked at this very carefully, but the fact is doing this through borrowing will push interest rates higher at a time when £1 in every £10 already goes on paying their interest.”
Strategic Military Investments
The overall package allocates £298bn over the next four years, with £15bn newly announced on Tuesday. The strategy prioritizes nuclear deterrence, next-generation aviation, and autonomous systems as the backbone of Britain’s future force structure.
The investment breakdown includes:
- Nuclear Submarines: £47bn for the Dreadnought replacement for Trident submarines and the Aukus attack submarine project, a joint development with the US and Australia intended to maintain the UK’s continuous at-sea deterrent.
- Nuclear Warheads and Fuel: £13bn for new warheads and £1.7bn for nuclear fuels to support the modernised deterrent fleet.
- Aviation: £8.6bn for the Gcap next-generation fighter aircraft project with Italy and Japan, and £1.1bn to maintain Typhoon aircraft until the 2040s, bridging the capability gap until Gcap enters service.
- Strategic Aircraft: A commitment of £1bn for 12 Lockheed Martin F-35A nuclear-capable jets, scheduled for after 2030, to deepen integration with allied air operations.
- Drone Capability: £5bn for air, land, sea, and underwater drones, an increase of £1bn over previous strategic spending reviews, reflecting the lessons of high-intensity conflict in Ukraine and elsewhere.
Starmer stated the plan focuses resources on “the readiness of our armed forces, reversing the cuts of recent years, prioritising the availability of our forces and assets, rebuilding ammunition stockpiles, ensuring we are ready to fight and defend our nation and better prepared to win.”
Internal Resistance and Departmental Cuts
To fund the additional £15bn, the government is implementing wide-ranging cuts across Whitehall. These include a 1% reduction in capital budgets across government departments, the sale of government assets for £1.1bn, and £2.8bn in cuts to road and energy projects – choices that will reverberate through local infrastructure plans and the government’s net zero timetable.
Within the Ministry of Defence, £10.7bn in efficiency savings will be sought through:
- A 10% reduction in civil servant staffing.
- A £1bn reduction in spending on consultants.
- The early retirement of 34 army Wildcat helicopters.
- The termination of Storm Shadow missile development.
Officials admit privately that some of these “efficiencies” may translate into reduced flexibility on overseas deployments and training, at least in the short term.
These measures have caused friction among ministers. Foreign Office minister Hamish Falconer protested the potential cancellation of a project to widen the Newark bypass near his Lincoln constituency, arguing that frontline communities should not bear the brunt of defence reprioritisation.
Starmer defended the decisions, stating, “Some capital projects, for example, on roads and energy, which are important but not immediately vital, will no longer go ahead as planned. But this is about taking the necessary choices, the right choices to protect our nation.”
The energy department has not yet specified which projects will be cut to meet its £2bn savings target, leaving businesses and local authorities uncertain over which schemes will lose central backing.
NATO Targets and Political Fallout
The plan raises overall defence spending from 2.6% of GDP in 2027 to 2.7%, or approximately £80bn, by 2030. While Starmer claims this puts the UK on a trajectory to reach 3% in the next parliament, the figure remains below the NATO target of 3.5% by 2035, agreed as part of alliance efforts to lift collective defence spending in response to Russia’s invasion of Ukraine.
This spending level led to the resignation of John Healey as defence secretary. Healey argued that the commitments were insufficient, stating:
“Britain will still be spending just 2.7% of GDP in 2030, the date when Nato has warned we could face a Russian attack.”
Healey further asserted that a clear target date to reach 3% spending is necessary if the UK is to credibly influence alliance planning and avoid pressure at future NATO summits, where progress against national pledges is routinely scrutinised under the alliance’s defence planning process.
Tan Dhesi, the Labour chair of the Commons defence committee, acknowledged the plan is “funded and scalable” but warned that it “is lacking in detail and doesn’t outline operational risks for areas being cut.” Members of the committee are expected to press for more granular capability assessments at forthcoming hearings.
The Treasury has confirmed that £1.8bn of the unfunded £4.7bn gap must be allocated within the next financial year. That decision will fall to Burnham’s first budget, setting up an early test of whether the new administration prioritises meeting allied spending benchmarks or protecting already-stretched domestic programmes such as health, adult social care and local government finance.
