Overview
The 2026 Defence Investment Plan (DIP) lands at an important moment. The Strategic Defence Review has moved the debate on from the assumptions of the post-Cold War period: the peace dividend has gone, the threats are more immediate, and Defence now has to think and act accordingly.
The DIP also recognised a hard truth. Future conflicts will be shaped by the ability to innovate, adapt and scale while events are already moving. The spending debate has shifted as a result. It is no longer whether Defence needs more money, but how quickly and effectively that money becomes usable capability. That should force a sharper question about how capability is really created. Platforms and technology matter, but they rarely deliver effect alone. In practice, capability comes when people, infrastructure, equipment, technology and support services are brought together in a way that works under pressure.
Much of that is not very visible. Dockyards, housing, barracks, airfields, training estates and secure facilities do not always attract the same attention as ships, aircraft or Army numbers, but without them Defence has nowhere to live, train, maintain, operate from, deploy from or return to. As longer-range weapon systems reshape the threat, UK infrastructure will increasingly need to provide operating bases that support training in peacetime and frontline operations in conflict. In some cases, this infrastructure will itself be viewed by adversaries as frontline capability and may be targeted accordingly. It therefore requires appropriate levels of protection, resilience and redundancy, with investment potentially comparable in scale to that required for major weapon systems. For suppliers, that is the point. Our role is not to overstate the importance of infrastructure, but to help Defence get more value, resilience and availability from the assets and services that enable operational capability.
There are encouraging signs. The National Armaments Director Group will bring more coherence to capability delivery, whether in the UK or overseas, while models such as Land Integrated Operating Services point to closer working between Defence and industry. It also has an important role in broadening capability planning to recognise that homeland defence, including the protection of critical national infrastructure, must be treated as a frontline requirement. That is welcome, but the measure of success will be practical: simpler delivery, clearer accountability and better outcomes for the front line.
Readiness depends on more than platforms
Defence capability is still often described through visible measures: ships, aircraft, armoured vehicles and people in uniform. Those measures matter, and they always will. But they do not tell the full story of readiness, because conflicts are won by connected systems rather than isolated platforms.
Ukraine has reminded us of that and has also shown how much integration capacity was allowed to weaken under the budgets and assumptions of a different era. This is not a new lesson. In the Battle of Britain, radar, early warning, airfields, production, pilot training, command structures and aircraft combined to create decisive effect. None was enough on its own.
The same applies now. Aircraft need maintenance, fleets need logistics, digital systems need security, and supply chains need to be trusted. All of that is obvious to those close to delivery, but it is still too often treated as secondary to acquisition. Readiness is created by interconnected systems of capability: skilled people – military and civilian, collectively trained – infrastructure, technology and support services, all working together.
People are part of the capability system
That is why Defence remains, at heart, a human endeavour. Military personnel, Reservists, civil servants, industry partners and suppliers all play a part in generating the effect on which national resilience depends. Technology changes the task, but it does not remove the need for skilled people to operate, maintain and sustain capability.
People also need the right environment in which to perform. Accommodation, workplaces, secure infrastructure and support services all affect morale, retention, readiness and delivery. That is where industry can help: removing friction, improving availability, strengthening resilience and allowing military personnel to focus on the tasks only they can do.
Greater integration creates greater value
This also changes the value-for-money debate. Value for money will be as important as the capabilities Defence chooses to buy, but that should not be confused with choosing the cheapest option. The real question is how clearly investment improves availability, resilience and mission outcomes. There is practical value to unlock through digitally enabled estates, predictive maintenance, better operational data and integrated asset management – all of which can improve performance, reduce downtime and extend asset life.
These are not just efficiencies. They are how Defence gets more operational effect from the resources it already has. In the current security and fiscal environment, that is central to readiness.
Connecting investment to operational effect
The DIP provides a useful framework and rightly positions Defence as part of the Government’s growth agenda. Its emphasis on UK industrial capability creates tangible opportunities for small, agile and innovative companies. Equally, for larger-scale infrastructure provision, suppliers and partners with proven delivery experience, resilient infrastructure capability and a long-term approach to stewardship will be key.
That optimism needs realism. Funding profiles, delivery capacity in the new National Armaments Director organisation, procurement reform, organisational bandwidth and routine HMT friction will all affect how quickly ambition becomes operational reality. Suppliers should be honest about their role in that context: no over-claiming, but a clear contribution through delivery experience, data, engineering discipline and long-term stewardship to the parts of Defence that have to work every day.
The challenge, then, is not simply deciding what to buy. It is making sure capability can be integrated, sustained, secured and deployed effectively throughout its life.
That is Defence’s hidden capability: the people, infrastructure, equipment, technology and support services that turn investment into usable military effect. It is not a substitute for new capability. It is what makes new capability work.
