The UK government published its Defence Investment Plan on 30 June 2026, committing to raise annual defence funding from £54 billion under the previous administration to almost £80 billion by 2029 — a real-terms increase of 27% as GDP share rises from 2.3% to 2.7%.

The Ministry of Defence's allocation for 2027–28 is set at £74 billion, according to the published plan — £20 billion above the final-year figure under the last government. The 2.5% of GDP threshold, previously scheduled for later in the decade, has been accelerated to 2027. The government has also stated an ambition to reach 3% within the next planning period, a target that goes beyond any formal commitment made by NATO allies to date.

What the money buys

The single largest new programme within the plan is drone transformation. More than £5 billion is earmarked over four years — described by the MoD as the largest such investment in the UK Armed Forces' history. Embedded within that figure is more than £1 billion for a digital-targeting web system for ground troops, with full operational delivery planned by 2027.

Accommodation for Royal Navy and wider Armed Forces personnel — a longstanding pressure point across the single services — receives more than £1.5 billion of additional funding announced through the Strategic Defence Review, intended to upgrade estate that has deteriorated over successive spending settlements.

The RAF's Eurofighter Typhoon fleet gains £204.6 million for production and integration of the ECRS Mk2 radar, a next-generation electronic combat and radar system that substantially upgrades the aircraft's electronic warfare capability. That contract was confirmed in June 2025.

Ukraine support sits alongside, rather than inside, the core spending commitments. The UK announced a £450 million surge package for Kyiv's armed forces — £350 million of which draws on this year's £4.5 billion military support allocation for Ukraine.

The political argument

The scale of the numbers has not insulated the plan from opposition scrutiny. Liberal Democrat leader Ed Davey said on 30 June 2026 that the investment plan was "late and underfunded." His party's defence spokesperson, James MacCleary MP, had earlier questioned the government's approach and the Lib Dems had indicated their intention to table a Humble Address — a parliamentary mechanism that compels the government to produce documents or answer specific questions — to force disclosure of details they said were missing from the plan. The party has separately proposed Defence Bonds as an alternative funding instrument, though the government has not adopted that model.

The Humble Address route is unusual but not unprecedented; it has been used in recent Parliaments on a range of sensitive subjects where opposition parties judged that conventional written questions or select committee scrutiny would move too slowly or yield too little.

Reading the numbers

The trajectory from 2.3% to a stated ambition of 3% of GDP represents a substantial structural shift in British public spending priorities. For context, the UK last sustained defence expenditure at or above 3% of GDP in the early 1990s. Reaching that level again would, on current GDP projections, imply an annual defence budget of well over £90 billion — larger than the entire NHS budget at the start of this decade.

What the plan does not yet resolve is the question of what comes after 2029. The ambition to reach 3% is explicit; the timetable and the spending review headroom required to get there are not. That gap is precisely where the Lib Dems' Humble Address challenge is aimed, and where the Treasury's position will matter as much as the MoD's.

The acceleration of drone and digital-targeting investment also reflects a clear doctrinal conclusion drawn from the war in Ukraine: that mass, distributed, autonomous systems now carry weight in peer-on-peer conflict that legacy platforms alone cannot replicate. The £5 billion drone commitment is the most concrete expression of that reading in the plan as published.