Defence spending is rising — from 2.3% of GDP to a committed 2.7% by 2027/28 — but the force it buys is 28% smaller than in 2010
£297.7bn is the CUMULATIVE, NOMINAL four-year total (2026/27–2029/30) behind that rise. More money is a fact; whether it meets a changing threat picture is harder — six tests, below.
Read this first — what else changes the meaning of the headline
- Real-terms spending growth
- +5%
Cash spending is up 53% since 2010 — real growth, after inflation, is far smaller. The headline figure below (£297.7bn) is cumulative and nominal, not inflation-adjusted.
MOD, Defence Departmental Resources 2025 (Worksheet 1: Defence Expenditure Outturn)
- Armed forces size
- -28%
Forces are smaller than at any point in decades — money committed does not by itself restore headcount; recruitment has only just turned positive.
- Major programmes rated Red
- 16 of 44
The government's own delivery-confidence rating for major equipment programmes — money spent does not guarantee on-time, on-budget delivery.
- Nuclear share of the budget
- ~1 in 5
Heading towards roughly 1 in every 4 pounds — a growing share that constrains what is left for conventional forces, equipment and people.
Public Accounts Committee, Ministry of Defence follow-up, Spring 2026
The question this section answers
Is Britain buying the defence capability its strategy says it needs — and is it getting enough security, readiness, industrial capacity and economic return for the money?
The four-year plan
- Day-to-day running costs — £172.6bnPay, training, maintenance and operations
- Investment — £125bnEquipment and infrastructure — the part with the delivery record below
Six tests, not one
Spending is the first link in a chain, not the answer. A country can spend heavily and still field a force that cannot deploy, or buy excellent equipment it cannot replace once a war consumes it. Each link below is measured separately, because the weakest one is what actually determines capability.
- 1Money
Is the budget rising in real terms, not just in cash?
+5%
Real-terms defence spending, 2010/11 to 2024/25. In cash it rose 53%.
Improving
See the detail - 2People
Are there enough trained personnel to operate what is bought?
−28%
UK Regular Forces since 2010. Intake exceeded outflow in the year to March 2026.
Strained
See the detail - 3Equipment
Are major programmes arriving on time and on budget?
16 of 44
9 independently rated Red, 7 more rated Red by the department itself.
Weak
See the detail - 4Readiness
How much of the force could actually deploy, and be sustained?
In doubt
Parliament found operational readiness proven but warfighting readiness in doubt.
Weak
See the detail - 5Industrial capacity
Could British industry replace what a war consumed?
85% UK
Of identified MOD spending with industry. Production rate, not spend share, is the real constraint.
Strained
See the detail - 6Operational effect
Does all of this produce credible deterrence and capability?
Mixed
Nuclear deterrence and intelligence are genuine strengths; land mass and sustainment are not.
Strained
The honest gap. Readiness carries no percentage anywhere on this site, because no official one exists — detailed readiness data is classified. The status shown above is Parliament’s own verdict: operational readiness proven but overstretched, warfighting readiness in doubt. Anyone who gives you a confident number for how long Britain could fight is not reading it off a published statistic.
Go deeper
- The moneyCash up 53% since 2010. Real terms, 5%.
- The peopleForces 28% smaller. Recruitment just turned positive.
- The equipment16 of 44 major programmes rated Red by the government.
- The nuclear enterprise£1 in every £5, heading towards £1 in every £4.
- The industrial base85% stays in the UK. Ten firms take 39%.
Strengths, weaknesses, opportunities, threats
Britain’s defence position is genuinely strong in some places and genuinely weak in others. Any summary that is all reassurance or all alarm is leaving half of it out.
Strengths
- One of only two nuclear-armed states in European NATO, with a continuously deployed submarine deterrent
- Five Eyes intelligence access — a force multiplier no spending comparison captures
- High-end capabilities few European states can reproduce: nuclear submarines, two carriers, F-35, strategic airlift
- A sovereign industrial base in submarines, warheads, complex weapons, radar and combat aircraft
- Leads NATO’s forward land presence in Estonia, with a brigade held at readiness to reinforce
- An unusually extensive overseas military presence for a European state
Weaknesses
- Regular forces 28% smaller than in 2010; the Army down roughly a third
- 16 of 44 major programmes rated Red — 9 independently assessed, 7 self-assessed by the department
- Nuclear enterprise takes 18% of the budget and is heading towards 25%
- Ten suppliers take over 39% of procurement; direct spending with SMEs is 4%
- Munitions and attrition resilience rebuilding from a low base
- Skills shortages across nuclear, engineering, shipbuilding and cyber — all bidding for the same people
- Readiness and sustainment not transparent enough for Parliament or the public to scrutinise
Opportunities
- £297.7bn of planned departmental spending over four years — scope to fix structural problems rather than manage decline
- Ukraine has shown cheap drones and autonomy can rebuild military mass without Cold War manpower
- Multi-year procurement visibility would let industry build factories and apprenticeships
- European rearmament creates scale for joint procurement of munitions, drones and air defence
- Closer UK–EU defence cooperation since the 2025 Security and Defence Partnership
- Deliberate SME expansion from a 4% base has a great deal of room to grow
Threats
- Russia as the principal conventional state threat driving NATO posture
- Hybrid attack: cyber, sabotage, undersea infrastructure, hostile intelligence activity
- Cheap drones and missiles capable of defeating far more expensive platforms
- Commitments geographically wider than the force has mass to sustain simultaneously
- Defence inflation eroding real purchasing power of the increase
- Industrial bottlenecks converting budget into equipment too slowly
- US strategic rebalancing towards the Indo-Pacific
Where Britain actually stands
Not one score out of ten. Britain is excellent at some of this and weak at other parts, and averaging those together would destroy the information that matters.
- Nuclear and strategic capabilityvery strong
A survivable submarine deterrent, committed to NATO. Very few states have this.
- Intelligencevery strong
Five Eyes access substantially exceeds what UK spending alone would buy.
- High-end naval and air capabilitystrong
Carriers, attack submarines, F-35 and Typhoon. Platform quality is high; availability, support and munitions determine how much usable capability that provides.
- Expeditionary reachstrong
An unusually extensive overseas presence for a European state — Cyprus, Gibraltar, the Falklands, Brunei and Kenya among others.
- Defence industrial sophisticationstrong
Sovereign capability in nuclear submarines, warheads, complex weapons, radar and combat-air design. Building at rate is the harder question.
- Spending relative to GDPmixed
Above the EU average, but no longer exceptional in Europe. Germany has overtaken the UK.
- Personnel trajectoryrebuilding
Recruitment has turned positive, but from a 28% smaller force and by a narrow margin.
- Munitions and attrition capacityrebuilding
Recognised as a priority; production rates are not published.
- Land-force massweak
The Army is roughly a third smaller than 2010 and 1,632 short of its own target.
- Procurement performanceweak
More than two in five assessable major programmes rated Red by the government.
- Equipment availabilityweak
No official whole-force readiness percentage exists — detailed readiness data is classified. The closest published proxy is the one platform an independent auditor has actually measured: F-35 mission-capable rate about half the mod’s target (NAO). See the readiness page for the full picture, including Parliament's own three-tier verdict.
The question underneath all of it
Britain is simultaneously trying to be a nuclear power, one of the United States’ closest European defence and intelligence partners, a leading NATO contributor, a global naval power, an Indo-Pacific partner, an Arctic power, a Baltic defender, a Middle East actor and a major supporter of Ukraine. The forces have 28% fewer people than in 2010.
Can a force this size do all of that at once — and if not, what comes first?
The 2025 Strategic Defence Review answers this with a “NATO first” posture. Whether that is the right priority is a political judgement this site does not make. What the data can show is that the commitments are wider than the mass, and that this is a choice rather than an accident.
What the £297.7bn figure doesn't tell you on its own
This page is built around not letting the headline spending figure stand alone — the four measures below are the specific reasons why.
Cumulative, not annual
Nominal, not real
Source: MOD, Defence Departmental Resources 2025 (Worksheet 1: Defence Expenditure Outturn)
A UK figure in an international context
Source: NATO, Defence Investment of NATO Countries (2014–2026), Table 3
Money is the first link in a chain, not the answer
Source: Strategic Defence Review 2025
Related: public finances for how defence sits against other departments, and the UK outlook for where defence appears among national strengths and threats.