The Government has published its Defence Investment Plan, setting out how it intends to spend increased defence funding over the next four years. The plan is designed to implement the 2025 Strategic Defence Review, improve the readiness of the Armed Forces, modernise military capability, and show Parliament, the public and industry how rising defence investment is being allocated [1].
At a glance
- The Defence Investment Plan is backed by £298 billion of defence investment over four years, including an additional £15 billion above the previous Spending Review settlement. The Government says this will take annual defence spending from £54 billion in 2023-24 to almost £80 billion by 2029-30 [1] [2] [3].
- The plan focuses on what the Government calls warfighting readiness. Major areas include drones and autonomous systems, nuclear deterrence, munitions, air and missile defence, cyber, space, digital targeting, defence industry, and procurement reform [2].
- The plan is not just a military document. It is also an industrial and economic policy. The Government says it will create nearly 60,000 additional direct and indirect UK defence industry jobs by the end of the decade and support more than half a million defence-related jobs overall [2] [5].
What is the Defence Investment Plan?
The Defence Investment Plan, or DIP, is the Government’s four-year plan for major defence investment following the 2025 Strategic Defence Review [1] [2].
Its purpose is to explain the main investment choices the Government has made for UK defence. It is not a complete list of every defence budget line or every military capability. Instead, it is intended to show how increased defence spending will be used, including to Parliament, the public, the Armed Forces and industry [1] [2].
In plain English, the plan tries to answer four questions.
First, what does the UK need to be ready for? The Government argues that the security environment has become more dangerous, pointing to Russia’s war in Ukraine, instability in the Middle East, threats to undersea infrastructure, cyber attacks, disinformation, and the rapid spread of drones, autonomy and artificial intelligence in modern conflict [2] [4].
Second, what kind of Armed Forces does the UK need? The plan points towards a force that is more ready, more technologically advanced, more integrated across land, sea, air, cyber and space, and better able to deter adversaries [2].
Third, where should the money go? The plan prioritises nuclear deterrence, drones, autonomous systems, munitions, air and missile defence, cyber, space, digital targeting, combat air, shipbuilding, defence industry and personnel support [2].
Fourth, how will the defence programme be kept affordable? The Government says it has examined the defence budget line by line, made trade-offs, and is resetting Ministry of Defence financial management so that future capability choices are affordable and deliverable [2] [4].
Why has the plan been published now?
The Defence Investment Plan follows the 2025 Strategic Defence Review. That review set the broad direction for UK defence. The DIP is the spending and delivery document intended to turn that direction into practical investment choices [1] [2].
The timing also reflects the Government’s view that the threat environment has worsened quickly. In the Prime Minister’s speech announcing the plan, he referred to wars in Ukraine and the Middle East, foreign-state activity in the UK, threats to underwater cables, and the way Ukrainian forces have used drones and technology to change the character of the battlefield [4].
That context matters because the plan is built around a central claim: the UK cannot simply maintain older military assumptions. The Government says it wants to move from a defence programme it describes as underfunded and poorly matched to current threats towards one shaped by readiness, deterrence, technology and industrial capacity [2] [4].
How much money is involved?
The headline figure is £298 billion over four years. The funding explainer gives a total Ministry of Defence budget of £297.7 billion from 2026 to 2030. That is made up of £172.7 billion of resource spending and £125 billion of capital spending [2] [3].
The yearly total rises from £68.3 billion in 2026-27 to £79.1 billion in 2029-30. The Government says that by 2029-30 the defence budget will be 27% higher in real terms than in 2023-24 [2] [3].
The plan includes an additional £15 billion over four years above the previous Spending Review settlement. The Government says £10.3 billion of this has already been identified, while a further £4.7 billion is still to be confirmed at Budget 2026 [3].
That last point is important. The plan sets out a large funding package, but not every element of that package is fully specified today. Readers should watch Budget 2026 closely, because it will need to confirm the remaining funding [3].
How is the extra money being found?
The Government says the additional funding is being found by reprioritising public spending, acting within fiscal rules, and avoiding cuts to day-to-day spending on frontline services such as health and education [3] [4].
The funding explainer says departments have been asked to contribute from capital budgets, with the Government also looking to make better use of assets such as underused land and buildings. The Department for Transport and the Department for Energy Security and Net Zero are specifically identified as departments with larger capital budgets that have been asked to make further contributions [3].
The Prime Minister framed this as a choice between defence investment, borrowing, and reductions elsewhere. He argued that borrowing would damage public finances and that taking money from day-to-day frontline services would weaken national resilience [4].
For readers, the practical point is that defence spending is being increased partly through trade-offs elsewhere in government. That does not make the plan wrong or right by itself, but it means the DIP should be read as a spending-priority document as well as a defence policy document.
What are the main defence priorities?
The Defence Investment Plan is broad, but several priorities stand out.
Drones, autonomy and AI
One of the clearest shifts is towards drones and autonomous systems. The Government says it will invest more than £5 billion over four years in drones and autonomous systems, describing this as the UK’s largest ever investment in drone warfare [2] [4].
This includes a Hybrid Navy, where crewed warships operate alongside uncrewed surface and underwater systems. It also includes drones and AI-enabled targeting for the Army, and early investment in Collaborative Combat Aircraft linked to the RAF’s future combat air capability [2].
The Prime Minister connected this directly to lessons from Ukraine, where drones, rapid innovation and relatively low-cost systems have changed how forces detect, strike and defend [4].
This is one of the most important parts of the plan. It suggests that the Government does not see drones as a specialist add-on, but as a core part of future military capability across the Navy, Army and RAF.
Nuclear deterrence and submarines
The largest single area of investment is the UK’s nuclear enterprise. The Government says the plan includes roughly £64 billion for the Defence Nuclear Enterprise over the four-year period. This includes new submarines, a new sovereign warhead, nuclear infrastructure, and the purchase of 12 F-35A aircraft so the UK can join NATO’s Dual Capable Aircraft nuclear mission [2] [4] [5].
The plan also refers to Dreadnought submarines, SSN-AUKUS, the nuclear estate and wider nuclear infrastructure. The Government describes the nuclear deterrent as the cornerstone of national security and links it directly to both UK and NATO defence [2] [5].
This section will likely attract close political and parliamentary scrutiny. Nuclear spending is long-term, expensive, and strategically significant. It also sits alongside conventional defence pressures, meaning the question is not only whether nuclear renewal proceeds, but whether the wider defence programme remains balanced while it does.
Munitions, missiles and air defence
The plan places strong emphasis on stockpiles and weapons production. It includes £11.1 billion for munitions and weapons, including long-range strike weapons, low-cost cruise missiles and one-way effectors. The Government says it intends to build at least six new energetics factories by 2030 and increase national munitions production capacity [2].
This reflects a major lesson from Ukraine: modern conflict can consume ammunition, missiles and drones at very high rates. Having advanced platforms is not enough if the UK cannot sustain them with sufficient weapons and supplies.
The plan also includes £790 million for Integrated Air and Missile Defence. That funding is intended to improve protection against air, drone and missile threats, including new radars, sensors, counter-drone systems, directed energy weapons, Sea Viper upgrades for Type 45 destroyers, and a new Integrated Air, Space and Missile Defence Operations Centre [2].
This is another area shaped by recent conflict. Air and missile defence has become central to homeland protection, deployed forces, overseas bases and support to allies.
Cyber, space and digital targeting
The plan treats cyber, space and digital systems as core defence capabilities rather than supporting extras.
It includes £2.5 billion for cyber and the electromagnetic domain, including the new Defence Cyber and Electromagnetic Force. The plan also includes £3.2 billion for space capabilities and £1.8 billion for a Digital Targeting Web designed to connect sensors, decision-makers and weapons across the integrated force [2].
The Digital Targeting Web is particularly important. In simple terms, it is about reducing the time between finding a target, deciding what to do, and acting. The Government says it will be underpinned by AI and software [2].
There is also £115 million to strengthen defences against AI-related threats, including risks linked to autonomous AI agents and biosecurity [5].
For readers, the wider significance is this: the plan is not only about buying ships, aircraft and vehicles. It is also about the systems that connect them, protect them, and allow them to act more quickly.
Navy, shipbuilding and maritime defence
The maritime section includes several strands: the nuclear submarine programme, the Hybrid Navy, frigates, autonomous vessels, undersea infrastructure protection and shipbuilding.
The plan refers to a combined force of 13 Type 26 frigates with Norway, five Type 31 frigates and Fleet Solid Support ships. It also refers to future autonomous surface and subsurface vessels, a possible amphibious fleet with the Netherlands, and a future Common Combat Vessel [2].
The Government also says it will invest £330 million in critical underwater infrastructure protection. This is framed against concerns about hostile activity around UK waters and undersea infrastructure [2].
This is an important part of the DIP because UK security depends heavily on maritime routes, undersea cables, energy infrastructure, submarine deterrence and NATO activity in the North Atlantic and High North.
Army capability and land forces
For the Army, the plan emphasises lethality, autonomy, long-range missiles, AI, armoured vehicles and a new way of fighting through reconnaissance-strike at all levels. The DIP says there will be over £20 billion to multiply the Army’s lethality through these areas [2].
The plan also refers to Challenger 3, Ajax, Boxer, RCH155 artillery, future rifle production and renewed UK industrial capacity for heavy gun barrels and munitions [2].
This part of the plan is significant because land forces have often been at the centre of debates about personnel numbers, readiness, procurement delays and equipment availability. The DIP’s answer is not simply to rebuild the Army in an older form, but to combine people, vehicles, sensors, drones, artillery and digital systems more tightly.
RAF and air combat
The plan includes more than £8 billion for the Global Combat Air Programme over four years. GCAP is the UK’s future combat aircraft programme with Italy and Japan, intended to develop a sixth-generation fighter [2] [5].
The plan also includes £300 million for Collaborative Combat Aircraft, which are autonomous aircraft intended to operate with existing and future fighters. It also includes investment in Typhoon sustainment into the 2040s and additional F-35 purchases [2].
A separate point worth noting is the plan for a new fast-jet training system, including replacement aircraft for the Red Arrows [2].
The combat air section matters not only militarily, but industrially. It supports the UK aerospace sector and links to long-term decisions about sovereign design, manufacturing, export potential and allied cooperation.
People, housing and veterans
Although the headline announcements focus heavily on equipment and technology, the DIP also includes personnel measures.
The plan refers to three above-inflation pay rises, a Defence Housing Strategy backed by £9 billion over ten years, a new Defence Housing Service, new property standards, and accelerated delivery of new homes on surplus defence land [2].
It also includes £70 million for veterans through the Office for Veterans’ Affairs, including the VALOUR programme and support linked to Op RESTORE, ASCENT, COURAGE and FORTITUDE [2].
This matters because equipment and technology cannot solve readiness problems on their own. Recruitment, retention, morale, housing and family support all affect whether the Armed Forces can sustain the people needed to use the capabilities being bought.
Defence industry, jobs and exports
The Government presents the DIP as part of its wider industrial strategy. It says defence spending should strengthen UK industry, create jobs, support skills, bring SMEs and start-ups into supply chains, and increase exports [2] [4] [5].
The plan says it will create nearly 60,000 new jobs by 2029-30, compared with 2023-24 levels. The Government also says forecast defence spending-related jobs supported in the UK will rise to more than half a million [2] [5].
A major announcement alongside the plan is a new £50 billion Defence Export Facility through UK Export Finance. The Prime Minister described this as the largest expansion of UK Export Finance support in its history [4].
The Government is also linking the plan to regional defence clusters, including Plymouth, South Yorkshire, Wales, Scotland and Northern Ireland, with Defence Growth Deals backed by £250 million over five years [2].
For Project Open Gov readers, the key point is that the DIP is not only about what the Armed Forces buy. It is also about where defence money flows, which sectors grow, and whether UK industry can produce the systems the plan depends on.
Procurement reform and financial control
One of the most important parts of the plan may be less visible: financial control.
The Defence Investment Plan says the Ministry of Defence will be required to provide an annual delivery update to Parliament, with the first due by July 2027. It also says new capability work should only begin when it is affordable and deliverable within the overall budget [2].
The plan includes a contingency that grows to 2% by the end of the period, and a one-off £500 million modernisation fund intended to unlock later efficiencies, including process streamlining, civil service exit costs, contract breakage costs and system modernisation [2].
The Government says this is intended to avoid past behaviour where work began before the programme was affordable, contributing to overheated and unaffordable plans [2].
This is a central test of the whole DIP. Defence plans often fail not because the stated ambition is unclear, but because delivery becomes unaffordable, delayed or overcomplicated. The annual reporting commitment should therefore be watched closely.
What remains uncertain?
The plan is substantial, but several questions remain.
First, the remaining £4.7 billion of funding still needs to be confirmed at Budget 2026. That means part of the financial settlement depends on future decisions [3].
Second, many of the most important commitments are long-term. Nuclear renewal, GCAP, submarine programmes, shipbuilding, munitions factories, digital targeting, housing improvement and procurement reform will all take years to judge [2].
Third, the Government says the plan involves moving away from some ageing traditional capabilities towards more advanced technology. That raises a practical question: which older capabilities will be reduced, delayed or retired, and whether the new systems will arrive quickly enough to offset them [2] [3].
Fourth, the Government’s NATO commitments extend beyond this four-year plan. The UK says it will increase defence spending to 3% of GDP in the next Parliament and, alongside NATO allies, reach 3.5% of GDP on defence spending by 2035. The DIP moves the UK towards those commitments, but does not by itself settle the spending path beyond 2029-30 [2] [3].
Fifth, the plan depends on industry being able to deliver. Drones, ships, submarines, munitions, nuclear infrastructure, cyber, space, AI and future aircraft all require skilled workers, supply chains, factories, investment and procurement discipline.
Why it matters
The Defence Investment Plan matters because it is the clearest statement so far of how the Government intends to turn increased defence spending into practical capability.
It is also significant because it shows the Government’s defence priorities. The plan places strong emphasis on readiness, deterrence, nuclear renewal, drones, autonomy, munitions, air and missile defence, cyber, space, digital integration and defence industry [2].
For the Armed Forces, the plan is a promise of more money, more modern equipment, better readiness and reform. For industry, it is a signal about future demand and investment priorities. For Parliament, it creates a document against which future delivery can be tested. For the public, it raises the central question of whether higher defence spending will produce visible improvements in national security and military readiness.
The DIP should therefore be read in two ways.
It is a policy statement, setting out what the Government wants to do.
It is also a delivery test, because the real measure will be whether the money, reforms and industrial plans produce the readiness and capability the Government says are now needed.
What to watch next
The first thing to watch is Budget 2026, because the Government says £4.7 billion of the additional funding will be confirmed there [3].
The second is the first annual DIP delivery update to Parliament, expected by July 2027. That should show whether the plan is being tracked in a way that allows Parliament and the public to judge progress [2].
The third is procurement delivery. The plan’s credibility depends heavily on whether the Ministry of Defence can buy faster, control costs better, and avoid overcommitting to programmes before they are affordable [2].
The fourth is industrial capacity. New munitions factories, shipbuilding, submarine work, combat air, drone production and digital systems will all require sustained delivery by UK industry [2].
The fifth is readiness itself. The core purpose of the plan is to improve the Armed Forces’ ability to deter, fight and defend. Over time, the practical signs to watch will include equipment availability, stockpiles, recruitment and retention, training, ship and aircraft readiness, and whether new technologies are actually integrated into front-line use.
Sources
[1] The Defence Investment Plan – GOV.UK publication page, GOV.UK 30 June 2026.
[2] The Defence Investment Plan, GOV.UK, 30 June 2026.
Useful page references:
- pp. 7–8: Secretary of State foreword; central purpose; inherited defence programme; £15bn increase; £298bn total; warfighting readiness; drones, AI and uncrewed systems; nuclear deterrent; air and missile defence; cyber, space and underwater infrastructure.
- pp. 9–11: Executive summary; £298bn headline; SDR link; autonomy; land lethality; cyber; space; jobs; nuclear deterrent; veterans; shipbuilding; munitions; air and missile defence; Digital Targeting Web.
- pp. 13–15: SDR vision; four-year programme; annual delivery update to Parliament by July 2027; affordability rules; £500m modernisation fund; spending profile and £297.7bn total.
- pp. 24–25: Integrated Force spending table, including Defence Nuclear Enterprise, Digital Backbone and Targeting Web, maritime, land, air, weapons and munitions, space, and cyber.
- pp. 29–31: Defence Nuclear Enterprise and Digital Targeting Web.
- pp. 35–37: Maritime domain, Hybrid Navy and future naval capability.
- pp. 40–41: Land forces, autonomy, missiles, counter-drone capability and Army lethality.
- pp. 44–46: Air domain, Typhoon, F-35, Collaborative Combat Aircraft, fast-jet training and GCAP.
- pp. 48–50: Space, cyber and electromagnetic capability.
- pp. 52–53: Weapons and munitions.
- pp. 60–61: People and veterans, including £70m for veterans and Op VALOUR.
- pp. 63–66: Defence industry, procurement, Defence Growth Deals, SMEs, skills and innovation.
- pp. 69–70: Defence infrastructure and estate, including housing.
- pp. 79–80: Annex summary table of domain spending.
[3] The Defence Investment Plan: Funding explainer, GOV.UK, 30 June 2026.
[4] PM speech announcing the Defence Investment Plan: 30 June 2026, GOV.UK, 30 June 2026.
[5] £15 billion new funding boost to transform Armed Forces and keep the UK safe, GOV.UK, 30 June 2026.