Chancellor John Healey used his first Budget on Wednesday to close the £4.7 billion hole in Britain's Defence Investment Plan, telling Parliament the plan is now paid for in full — with the money found by cutting every other department's building budgets and dipping into the Treasury's own reserve.
"In today's budget, I am fully funding the Defence Investment Plan, including through capital reprioritisation across Whitehall," Healey told MPs. "This honours the commitment made both by me — and by the prime minister."
The Defence Investment Plan is the blueprint meant to rebuild Britain's armed forces for a more dangerous decade. Published in June, it sets out almost £298 billion of Ministry of Defence spending over four years, including £15 billion of extra investment behind the priorities of last year's Strategic Defence Review. Defence spending this year is already £14 billion higher than in the final year of the previous government, and the plan carries Britain to 2.7 percent of GDP on defence by 2027-28.
The extra money is aimed squarely at the warfare Britain has watched unfold in Ukraine and the Middle East: more than £5 billion for drones, autonomous weapons and unmanned systems, a "hybrid" Royal Navy mixing warships with sea drones, autonomous aircraft to fly alongside the RAF's manned jets by 2030, a stronger nuclear deterrent, a £2.1 billion Defence Innovation Fund, and plans for at least six new munitions factories so Britain can make its own shells and explosives again.
The hole Healey had to fill was not of his making. When the plan was announced as one of Sir Keir Starmer's final acts as prime minister, it promised the full £15 billion but identified funding for only £10.3 billion of it, leaving £4.7 billion — about $6.3 billion — to be found later. Healey, who had resigned as defence secretary earlier this year in a row over exactly this kind of shortfall, inherited the bill when he moved into the Treasury.
The Budget's published figures show two moves. First, departmental capital budgets will be cut by a further 1 percent in every year from 2027-28 to 2029-30, raising £3 billion. It is the second time departments have been raided this way: an earlier 1 percent trim helped pay for the first £10.3 billion. Second, the remaining £1.7 billion comes from what the Budget documents call "unallocated contingency in the Treasury's capital reserve" — money set aside but never assigned to anything.
Capital budgets are not the money that pays nurses or police officers. They are the money that builds: the roads, rail lines, hospitals, schools and energy projects departments plan years ahead. Every department has been told to find its 1 percent, and none has yet said what will go. The warning from the last round is concrete — when departments were trimmed earlier this year, a number of major road improvement schemes were scrapped altogether, and the government has already pointed to transport and energy budgets as part of this reallocation.
Filling this hole is only the first climb. Under the commitment NATO allies made at The Hague, Britain is pledged to reach 3 percent of GDP on defence by 2030 and 3.5 percent on core defence by 2035. Healey did not lay out that full pathway on Wednesday: the detailed route is deferred to next year's spending review, and he warned it would mean "looking hard at public spending," alongside what he called "more innovative financing, alongside the private sector and our international allies." The Office for Budget Responsibility has put the extra cost of reaching 3 percent alone at about £17.3 billion a year by 2029-30.
Part of that private-money push starts now. A new Innovative Defence Finance Taskforce will hunt for ways to pull investment into defence, Britain will open treaty negotiations with Finland, Poland and the Netherlands on a Multilateral Defence Mechanism to pool allied money and speed joint buying, and the National Wealth Fund and British Business Bank will deploy up to £5 billion over four years into defence, dual-use technology and sovereign capability. Healey and Prime Minister Andy Burnham also reaffirmed roughly £10 billion of economic and military support for Ukraine.
The announcement drew a welcome from the top of the alliance. NATO Secretary General Mark Rutte said the Budget showed "a strong commitment on defence," adding: "The UK role in transatlantic security is vital, and I welcome this move to put [Britain] on a credible path towards meeting the commitment made by all NATO Allies." Ukraine's President Volodymyr Zelensky had pressed Healey before the Budget not to delay: "Can the United Kingdom trust Russia or not? If not, defence needs to be 100% the priority. My advice to John is don't delay."
The opposition Conservatives, who had demanded Healey resign if he failed to produce a credible plan, were scathing about what he left for next year. "He should have set out a plan for 3% today," party leader Kemi Badenoch said. "He is the man who is making our country less safe. He has failed his own test… If he had any decency he would resign again today." What Britain got instead, she said, was "a plan to have a plan. I bet Putin's really scared now." Defence Secretary Wes Streeting hit back that the Conservatives "shrunk the British Army to its smallest size since the Napoleonic era and left a £17 billion hole in the equipment plan."
For the United States, the significance is direct: the 3.5 percent target is the one Washington pressed the whole alliance to accept, and it only means something if America's closest European ally actually pays for the forces it has promised — the drones, ships, jets and shell factories that sit inside the same NATO plans as American troops. For British households, the trade arrives closer to home, in thinner departmental building budgets whose contents have yet to be named. Healey's case is that deterrence is the country's insurance premium, and that Wednesday's Budget finally pays the first instalment in full. The test of the rest comes at next year's spending review.
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