The current debate around delivery of the long-delayed UK’s Defence Investment Plan has been framed in overly simplistic terms. Ships versus drones. Steel versus software. Tradition versus innovation.
Defence debates often fixate on budgets and platforms. But resilience is not built through incremental funding adjustments. It comes from structural change, and autonomy is the only credible pathway to achieve it. This is not just a UK conversation. It reflects a broader shift across NATO, where operational learning from Ukraine is redefining how mass, survivability, and combat effectiveness are generated.
For years, the UK has struggled to align ambition, funding, and delivery. Programmes move slowly, procurement is rigid, and industrial capacity is optimised for long timelines rather than rapid adaptation. Meanwhile, the character of conflict has shifted. Ukraine and the Middle East have demonstrated that scale, speed, and adaptability now define military effectiveness as much as technological sophistication.
The UK does not simply face a capability gap. It faces a systems problem. The publication of the Defence Investment Plan only reinforces this conclusion. While much attention has focused on investment levels and headline procurement commitments, the more significant signal is the UK’s recognition that autonomous and uncrewed systems must become a central pillar of future force design. The challenge now is no longer whether autonomy matters, but whether the UK can move fast enough to industrialise and deploy it at scale.
The Frozen Defence Ecosystem
The UK defence model is built around large, complex, crewed platforms. These systems deliver high-end capability, but they are slow to design, slow to procure, and slow to adapt. Requirements are often fixed early, timelines stretch beyond a decade, and cost growth constrains future investment.
Most critically, the system delivers relatively small numbers of high-value assets.
This model is increasingly misaligned with modern warfare. In Ukraine, relatively low-cost drones are degrading and destroying expensive platforms at scale. The cost exchange ratio has shifted. Mass, enabled by autonomy and supported by data, now shapes outcomes.
Al Carns, a former Royal Marines officer, special operations commander, and Armed Forces Minister, has been direct on this point. Drawing on battlefield experience, he has warned that the UK risks preparing for the wrong kind of war, as low-cost autonomous systems reshape the battlefield faster than traditional procurement can respond.
The implication is clear. The existing model cannot scale at the speed or volume required.
Autonomy as a Scaling Mechanism
Autonomous systems represent more than a capability upgrade. They change how military power is generated.
Across domains, the shift is already visible. Aerial drones deliver surveillance and strike at low cost. Uncrewed surface vessels extend maritime reach without exposing crews. Subsea systems provide persistent awareness of contested infrastructure. On land, uncrewed systems support logistics, reconnaissance, and increasingly frontline operations.
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What matters is not just autonomy, but scalability. These systems can be produced in volume, deployed in distributed formations, and adapted rapidly through software rather than hardware redesign.
Carns has framed this shift as a defining moment for modern militaries, comparable to transformative technologies that reshaped warfare in previous eras. The comparison reflects operational reality. In Ukraine, thousands of drones are deployed daily, compressing decision cycles and reshaping the battlespace.
Autonomy changes the economics of force design. It allows militaries to generate mass without proportionally increasing cost or personnel. For a system constrained by both time and funding, that is a structural advantage.
From Platforms to Systems of Systems
The shift toward autonomy accelerates a move away from platform-centric thinking.
Traditional force structures are built around individual platforms delivering defined effects. A destroyer provides air defence. A fighter aircraft delivers strike. A submarine provides deterrence. These roles remain important, but they are increasingly complemented by distributed networks of sensors, effectors, and decision systems.
Autonomous platforms act as nodes within these networks. They collect data, relay information, and execute tasks as part of a wider architecture. Artificial intelligence accelerates processing. Connectivity enables coordination across domains in near real time.
The result is a more distributed and resilient force. Capability is no longer concentrated in a small number of critical platforms but spread across many nodes, reducing vulnerability and increasing adaptability.
This demands a fundamental shift in mindset. Integration, interoperability, and data architecture become as important as the platforms themselves.
An Industrial Reset
The implications extend far beyond operations into the structure of the defence industrial base.
The traditional model is dominated by large prime contractors delivering complex programmes over long timelines. This approach is not aligned with the speed, iteration, and software-driven innovation that autonomy demands.
Autonomous systems open the ecosystem. SMEs, software firms, and dual-use technology companies become central contributors. Development cycles shorten. Capability evolves continuously rather than through periodic upgrades.
Carns has highlighted a critical requirement. Recognising the importance of drones is not enough. The UK must be able to produce autonomous systems at scale. Without industrial capacity, autonomy remains conceptual rather than operational.
This creates both opportunity and disruption. It enables a more dynamic and innovative supply base while challenging established structures and incentives.
Autonomy is not just a military shift. It is an industrial one.
The Risk of Overcorrection
Despite its potential, autonomy is not a complete substitute for traditional capability.
Surface combatants still provide presence and deterrence. Submarines deliver strategic effect. Crewed air systems remain essential in contested environments.
The risk is not resistance to change, but overcorrection. Reducing investment in high-end platforms without fully matured autonomous alternatives could create new vulnerabilities.
Carns has been clear on this point. The future force requires balance. Mass-produced autonomous systems must complement high-end capability, not replace it outright.
There is also the enduring constraint of funding. Autonomy improves efficiency, but it does not remove the need for sustained investment.
Unlocking the System
The UK’s defence challenge is not simply one of modernisation. It is one of transformation.
The current ecosystem, shaped by decades of platform-centric thinking and industrial inertia, is poorly aligned with the demands of contemporary conflict. Autonomous systems offer a way to break this cycle. Not because they replace everything that came before, but because they enable a different model of capability. One built on scale, adaptability, and speed. They support distributed operations. They accelerate innovation. They reshape the industrial base. Most importantly, they provide a mechanism to unlock a system that has become constrained by its own structure.
The debate should not be framed as a choice between ships and drones. It should focus on how autonomy can be integrated to create a more flexible, resilient, and responsive force. Because the real risk is not moving too quickly. It is staying frozen while everything else accelerates. The Defence Investment Plan provides an important framework for this transition. Success, however, will be measured not by the document itself but by the speed at which autonomous capability reaches the front line.