UK Defence Spending Hits 2.3% of GDP: Meeting NATO Target But Facing Capability Gaps

Britain's defence budget reached £57.8 billion in 2024-25, representing 2.3% of GDP and comfortably exceeding NATO's 2% spending target. The UK ranks third in NATO by total defence spending (after the United States and Germany) and fifth globally (after the US, China, Russia, and India). On paper, Britain remains a major military power with nuclear weapons, aircraft carriers, advanced fighter jets, and global reach. In practice, the armed forces face severe challenges: the Army has shrunk to its smallest size since the Napoleonic Wars, major equipment programmes are years behind schedule and billions over budget, and the Ministry of Defence (MoD) confronts a £16.9 billion funding gap over the next decade. Meeting NATO's percentage target does not guarantee military capability—and the gap between Britain's defence ambitions and the resources available to deliver them has never been wider.

The Numbers: Where the Money Goes

The UK's £57.8 billion defence budget for 2024-25 breaks down as follows, according to the Ministry of Defence's Annual Report and Accounts:

• £24.1 billion (42%) on personnel costs: salaries, pensions, training, and welfare for 188,000 regular armed forces personnel, 38,000 reservists, and 57,000 civilian staff
• £18.7 billion (32%) on equipment and support: buying new ships, aircraft, vehicles, and weapons, plus maintaining and upgrading existing equipment
• £9.2 billion (16%) on infrastructure and estates: bases, barracks, training facilities, and property
• £5.8 billion (10%) on other costs: research and development, intelligence, cyber operations, and central administration

The largest single programme is the Dreadnought-class nuclear submarines (£31 billion over 30 years), which will replace the current Vanguard-class boats carrying Britain's Trident nuclear deterrent. Other major equipment programmes include:

• Type 26 frigates: £8.2 billion for eight ships (up from £6.2 billion in 2017)
• Ajax armoured vehicles: £5.5 billion for 589 vehicles (up from £3.5 billion in 2014)
• F-35B Lightning II fighters: £9.8 billion for 48 aircraft (with an option for 90 more)
• Astute-class attack submarines: £9.75 billion for seven boats
• Boxer armoured vehicles: £2.8 billion for 623 vehicles

Meeting NATO's 2% Target—But What Does It Mean?

At the 2014 NATO summit in Wales, all member states committed to spending at least 2% of GDP on defence by 2024. The target was introduced in response to Russia's annexation of Crimea and concerns that European NATO members were free-riding on American military power. As of 2024, only 11 of 32 NATO members meet the target: the United States (3.5%), Poland (4.1%), Estonia (3.4%), Lithuania (3.0%), Finland (2.4%), Romania (2.4%), Hungary (2.4%), Latvia (2.3%), the UK (2.3%), Greece (2.3%), and Slovakia (2.1%).

The UK has met the 2% target every year since 2015, and successive governments have committed to maintaining it. However, the 2% figure is a political metric, not a measure of military capability. It tells you how much a country spends relative to the size of its economy, but not whether that spending delivers effective armed forces. The UK's 2.3% includes:

• Pensions for retired service personnel: Around £6.5 billion per year, or 11% of the defence budget, counts towards the NATO target even though it does not buy current military capability
• Military aid to Ukraine: £3 billion in 2024, which counts towards the 2% but is not available for UK forces
• Intelligence agencies: GCHQ and parts of the Secret Intelligence Service (MI6) are funded through the defence budget and count towards the 2%, even though they are not strictly military

Strip out pensions, Ukraine aid, and intelligence, and the UK's "core" defence spending falls to around 1.8% of GDP—below the NATO target. This is not cheating (all NATO members use similar accounting), but it shows that the headline percentage can be misleading.

The Funding Gap: £16.9 Billion Short

In November 2024, the National Audit Office (NAO) published its annual review of the MoD's Equipment Plan 2024-2034, which sets out what the armed forces want to buy over the next decade. The NAO found a £16.9 billion gap between the cost of the plan (£305.6 billion) and the funding available (£288.7 billion). This gap has grown from £10.9 billion in 2023 and £16.5 billion in 2022, and the NAO warned it is likely to widen further as costs rise.

The funding gap exists for several reasons:

1. Equipment Costs Rising Faster Than Budgets

Defence equipment is subject to cost inflation that typically runs higher than general inflation. Factors include:

• Complexity: Modern military equipment is far more sophisticated than previous generations. A Type 26 frigate has advanced radar, sonar, and combat systems that did not exist when the Type 23 frigates it replaces were designed in the 1980s. This drives up costs.
• Supply chain pressures: The war in Ukraine has increased demand for munitions, armoured vehicles, and other equipment, pushing up prices. Semiconductor shortages have delayed production of electronics.
• Currency fluctuations: Much defence equipment is bought from the US or uses US components priced in dollars. The pound's weakness against the dollar (£1 = $1.27 in January 2025, down from $1.50 in 2014) has increased costs.

The MoD's budget has grown in cash terms, but not fast enough to keep pace with these cost pressures. The 2024-25 budget of £57.8 billion is up from £52.1 billion in 2023-24, but much of the increase is absorbed by inflation rather than buying more capability.

2. Major Programmes Over Budget and Behind Schedule

Several of the MoD's largest equipment programmes are significantly over budget and delayed:

• Ajax armoured vehicles: Ordered in 2014 for £3.5 billion, the programme is now costed at £5.5 billion and running seven years late. The vehicles have suffered from excessive vibration and noise that caused hearing damage and nausea in crews, and are still not cleared for operational use as of January 2025.
• Type 26 frigates: The first ship, HMS Glasgow, was due to enter service in 2023 but is now expected in 2028. The cost has risen from £6.2 billion for eight ships in 2017 to £8.2 billion in 2024.
• Dreadnought submarines: The programme is running 12-18 months behind schedule, and the NAO estimates the final cost could exceed £31 billion.

When programmes overrun, the MoD must either find extra money (which comes from other programmes or capabilities) or accept delays and reduced quantities.

3. Unfunded Commitments

Successive governments have announced new defence capabilities without allocating the funding to pay for them. Examples include:

• Increasing the Army to 82,000: The 2021 Defence Command Paper set a target of 82,000 regular soldiers by 2025, but the Army has shrunk to 73,000 and the MoD has not funded the recruitment and retention measures needed to reverse the decline.
• Sixth-generation fighter jet (Tempest): The UK is developing a new fighter jet with Italy and Japan to replace the Typhoon from the 2040s. The programme is expected to cost tens of billions, but funding beyond initial design work has not been committed.
• Replenishing munitions stocks: The UK has donated significant quantities of ammunition, missiles, and other munitions to Ukraine. Replacing these stocks will cost billions, but the MoD has not allocated funding.

The NAO concluded that the MoD must either secure additional funding, cancel or delay programmes, or accept capability gaps. Without action, the funding gap will continue to grow.

The Recruitment Crisis: An Army Smaller Than Napoleon's

The British Army has 73,000 regular troops as of January 2025, its smallest size since the Napoleonic Wars (when the Army had around 70,000 regulars in 1815, though this excludes militia and reserves). The target is 82,000, meaning the Army is 9,000 short—a 12% shortfall. The Royal Navy has 33,000 personnel against a target of 35,000, and the Royal Air Force has 34,000 against a target of 35,000.

The armed forces have struggled to recruit and retain personnel for several reasons:

1. Uncompetitive Pay and Conditions

Military pay has lagged behind the private sector and even other public sector jobs. A newly qualified Army infantry soldier earns £23,496 per year, compared to £28,000 for a police constable or £30,000 for a train driver. The 2024 pay rise for armed forces personnel was 5%, below inflation and below the 7% awarded to police and NHS staff.

Service personnel also face:

• Frequent moves: Military families move every 2-3 years on average, disrupting children's education and spouses' careers
• Long deployments: Personnel can spend 6-9 months away from home on operations or training
• Poor accommodation: A 2023 National Audit Office report found that 37% of military accommodation failed to meet the MoD's own standards

2. Outsourced Recruitment

In 2012, the MoD outsourced Army recruitment to Capita, a private contractor, in a deal worth £1.36 billion over 10 years. The contract has been widely criticised:

• Slow processing: It takes an average of 254 days from application to starting training, compared to 100 days before outsourcing. Many applicants drop out during the wait.
• IT failures: Capita's recruitment system has suffered repeated technical problems, losing applications and delaying processing.
• Missed targets: Capita has missed its recruitment targets every year since 2012. The contract was extended to 2022, then again to 2024, and the MoD is now bringing recruitment back in-house.

3. Demographic and Cultural Shifts

The armed forces draw recruits primarily from working-class communities in the Midlands, North, Scotland, and Wales. These communities have been hit hard by deindustrialisation, austerity, and the cost-of-living crisis, and fewer young people see the military as an attractive career. The Army's traditional recruiting grounds—former mining and industrial towns—have shrunk.

The armed forces also face competition from other employers. Unemployment is low (4.2% as of January 2025), and young people have more options than in previous decades. The military's offer—modest pay, frequent moves, risk of injury or death—is less compelling when civilian jobs are plentiful.

Equipment Delays and Capability Gaps

The MoD's equipment programme is plagued by delays, cost overruns, and capability gaps:

Ajax Armoured Vehicles: A £5.5 Billion Failure?

The Ajax programme was meant to deliver 589 modern armoured reconnaissance vehicles to replace the ageing CVR(T) fleet. Ordered in 2014 for £3.5 billion, the programme is now costed at £5.5 billion and running seven years late. The vehicles have suffered from:

• Excessive vibration and noise: Crews reported hearing damage, nausea, and swollen joints after operating the vehicles. Trials were suspended in 2021.
• Design flaws: The vehicles are too heavy, too loud, and have reliability issues with the engine and suspension.
• No operational clearance: As of January 2025, Ajax is still not cleared for operational use. The MoD is negotiating with the manufacturer (General Dynamics) to fix the problems, but it is unclear when—or if—the vehicles will enter service.

The Army has had to extend the life of the CVR(T) fleet, some of which are over 50 years old, at significant cost.

Type 26 Frigates: Eight Ships, Eight Years Late

The Type 26 frigate is designed to replace the Type 23 frigates that have been in service since the 1990s. Eight ships are planned, at a cost of £8.2 billion (up from £6.2 billion in 2017). The first ship, HMS Glasgow, was due to enter service in 2023 but is now expected in 2028—a five-year delay. The remaining seven ships will follow at roughly one per year, meaning the programme will not be complete until the mid-2030s.

The delays mean the Royal Navy must keep the Type 23s in service longer than planned, at increasing maintenance cost and with reduced capability (the Type 23s lack the advanced radar and sonar of the Type 26).

F-35 Fighter Jets: Capability at a Price

The UK has ordered 48 F-35B Lightning II stealth fighters, with an option for up to 90 more. The F-35 is the most advanced fighter jet in the world, but it is also the most expensive:

• Unit cost: £100 million per aircraft (including development costs)
• Operating cost: £30,000 per flight hour, compared to £10,000 for the Typhoon
• Availability: The F-35 has suffered from low availability rates (the percentage of aircraft ready to fly at any given time), averaging 50-60% compared to 70-80% for the Typhoon

The UK has committed to buying only 48 aircraft, enough to equip one carrier air group (24 jets on HMS Queen Elizabeth or HMS Prince of Wales, with 24 in reserve and training). This is far below the 138 Harriers the F-35 replaces, and means the UK can deploy only one carrier at a time.

The Nuclear Deterrent: Crowding Out Conventional Forces

The UK's nuclear deterrent—four Vanguard-class submarines carrying Trident II D5 missiles—costs around £6 billion per year to operate and maintain. The submarines are being replaced by four new Dreadnought-class boats at a cost of £31 billion over 30 years (around £1 billion per year during construction, rising to £1.5 billion per year once in service).

The nuclear deterrent is ring-fenced in the defence budget, meaning it cannot be cut to fund conventional forces. This has led to criticism that the deterrent is crowding out spending on the Army, Navy, and Air Force. The Campaign for Nuclear Disarmament argues that the £31 billion for Dreadnought could instead buy:

• Eight Type 26 frigates (£8.2 billion)
• 48 F-35 fighters (£4.8 billion)
• 589 Ajax armoured vehicles (£5.5 billion)
• And still have £12.5 billion left over

Supporters of the deterrent argue that nuclear weapons are essential to Britain's security and global status, and that the cost (around 10% of the defence budget) is justified. The debate is unlikely to be resolved, but the trade-off is real: every pound spent on the nuclear deterrent is a pound not spent on conventional forces.

Comparing the UK to Other Major Powers

United States: The Superpower

The US defence budget is $877 billion in 2024-25, or 3.5% of GDP. This is more than the next 10 countries combined. The US has:

• 1.3 million active-duty personnel (plus 800,000 reserves)
• 11 aircraft carriers (the UK has 2)
• 68 nuclear submarines (the UK has 11)
• 13,000 military aircraft (the UK has 693)

The US accounts for 68% of NATO's total defence spending and provides the bulk of the alliance's military capability, including nuclear weapons, strategic airlift, intelligence, and missile defence.

China: The Rising Power

China's defence budget is $292 billion in 2024 (official figure; Western estimates suggest the true figure is closer to $400 billion). China has:

• 2 million active-duty personnel (the world's largest military)
• 3 aircraft carriers (with more under construction)
• 79 submarines (including 12 nuclear)
• 3,000 military aircraft

China is rapidly modernising its military and expanding its global reach, particularly in the Indo-Pacific. The UK is increasing its focus on the region (the 2021 Integrated Review identified the Indo-Pacific as a priority), but Britain's military presence is dwarfed by China's.

Russia: The Declining Power

Russia's defence budget is $109 billion in 2024 (official figure; actual spending is likely higher due to off-budget items). Russia has:

• 1.15 million active-duty personnel
• 1 aircraft carrier (currently non-operational)
• 64 submarines (including 29 nuclear)
• 4,000 military aircraft

Russia's military has been severely degraded by the war in Ukraine, with heavy losses of personnel and equipment. However, Russia retains the world's largest nuclear arsenal (5,580 warheads, compared to the UK's 225) and remains a major threat to European security.

France and Germany: European Peers

France spends €50 billion (£43 billion) on defence, or 1.9% of GDP. France has:

• 200,000 active-duty personnel
• 1 aircraft carrier
• 10 nuclear submarines
• 1,050 military aircraft

France is the only other European country with nuclear weapons, aircraft carriers, and global military reach comparable to the UK. The two countries cooperate closely on defence (the Lancaster House treaties of 2010) and often deploy together.

Germany spends €66 billion (£57 billion) on defence, or 1.6% of GDP. Germany has:

• 184,000 active-duty personnel
• 0 aircraft carriers
• 6 submarines (all conventional)
• 618 military aircraft

Germany has the largest economy in Europe but has historically under-invested in defence. The war in Ukraine has prompted a major increase in German defence spending (the government announced a €100 billion special fund in 2022), and Germany is now NATO's second-largest spender by total budget (overtaking the UK in 2024).

The Strategic Context: What Is the UK Defending Against?

The UK's defence posture is shaped by three main threats:

1. Russia

Russia is the most immediate military threat to the UK and NATO. Russia's invasion of Ukraine in February 2022 shattered the post-Cold War security order and demonstrated that large-scale conventional war in Europe is possible. Russia has:

• Threatened nuclear use against NATO if it intervenes in Ukraine
• Conducted cyber attacks against UK government, military, and critical infrastructure
• Violated UK airspace and waters with military aircraft and submarines (the RAF scrambles Typhoon fighters to intercept Russian bombers several times per year)

The UK has responded by increasing its military presence in Eastern Europe (leading a NATO battlegroup in Estonia), providing military aid to Ukraine (£3 billion in 2024), and strengthening cyber and intelligence capabilities.

2. China

China is a long-term strategic challenge rather than an immediate military threat. China's military modernisation, territorial ambitions (particularly regarding Taiwan), and assertiveness in the South China Sea pose risks to UK interests:

• Trade routes: 40% of UK trade passes through the South China Sea
• Allies: The UK is committed to defending Australia, Japan, and other Indo-Pacific partners
• Technology: China is competing with the UK and its allies in advanced technologies (AI, quantum computing, hypersonics) with military applications

The UK has increased its military presence in the Indo-Pacific (deploying the HMS Queen Elizabeth carrier strike group in 2021) and deepened defence partnerships with Japan, South Korea, and Australia (the AUKUS pact with the US and Australia).

3. Terrorism and Instability

Terrorism and instability in the Middle East, North Africa, and the Sahel pose ongoing threats to UK security. The UK maintains military deployments in:

• Iraq and Syria: Around 400 personnel supporting the fight against ISIS
• Mali and the Sahel: Training and intelligence support to counter jihadist groups
• Cyprus: Two sovereign base areas used for intelligence gathering and operations in the Middle East

The UK also faces domestic terrorism threats (both Islamist and far-right) that require intelligence and counter-terrorism capabilities.

The Choices Ahead: What Can Britain Afford?

The UK faces difficult choices about its defence priorities. The armed forces cannot do everything with the current budget, and the government must decide what to prioritise:

Option 1: Increase Spending

The most straightforward solution is to increase the defence budget. The government could commit to 3% of GDP (around £75 billion per year), which would close the funding gap and allow the armed forces to recruit more personnel, buy more equipment, and maintain readiness. However:

• Fiscal constraints: The UK faces a large budget deficit and high public debt. Increasing defence spending would require cuts elsewhere (health, education, welfare) or tax rises, both of which are politically difficult.
• Public opinion: Polls show the public supports maintaining defence spending, but not at the expense of the NHS or other services.

Option 2: Focus on High-End Warfighting

The UK could prioritise capabilities needed to fight a major war (against Russia or China) and reduce or eliminate capabilities for lower-intensity operations (counter-terrorism, peacekeeping, humanitarian intervention). This would mean:

• Keeping: Nuclear deterrent, aircraft carriers, F-35 fighters, Type 26 frigates, cyber and intelligence
• Cutting: Light infantry, special forces, overseas bases, peacekeeping commitments

This would make the UK a more credible ally to the US and NATO in a major war, but less able to respond to crises in the Middle East, Africa, or elsewhere.

Option 3: Focus on Niche Capabilities

The UK could accept that it cannot compete with the US, China, or Russia in overall military power, and instead focus on niche capabilities where it has a comparative advantage:

• Special forces: The SAS and SBS are among the world's best
• Intelligence: GCHQ and MI6 are first-rate
• Cyber: The UK is a leader in offensive and defensive cyber operations
• Nuclear: The UK is one of only nine nuclear-armed states

This would make the UK a valuable ally in specific areas, but less able to deploy large-scale conventional forces.

Option 4: European Defence Integration

The UK could deepen defence cooperation with European allies (particularly France and Germany) to share costs and capabilities. This could include:

• Joint procurement: Buying equipment together to reduce costs (e.g., the Tempest fighter jet with Italy and Japan)
• Shared capabilities: Pooling assets like transport aircraft, tankers, and intelligence
• Integrated command: Operating under joint European command structures

This would reduce costs and increase capability, but would require political will and trust that is currently lacking (particularly post-Brexit).

The Bottom Line

The UK spent £57.8 billion on defence in 2024-25, representing 2.3% of GDP and exceeding NATO's 2% target. Britain ranks third in NATO and fifth globally by defence spending. However, the armed forces face severe challenges: the Army has shrunk to 73,000 troops (its smallest size since the Napoleonic Wars), major equipment programmes are years behind schedule and billions over budget, and the Ministry of Defence faces a £16.9 billion funding gap over the next decade. Meeting NATO's percentage target does not guarantee military capability, and the gap between Britain's defence ambitions and available resources has never been wider. The UK must choose: increase spending, accept reduced capability, or fundamentally rethink its defence priorities. Without action, Britain risks becoming a second-tier military power unable to defend its interests or support its allies.