Why semiconductors became a matter of national strategy
Chips are the hidden infrastructure of the modern economy, and their concentrated, fragile supply chain has turned them into a question of national security rather than just industrial policy.
Small components, enormous leverage
Semiconductors, more commonly called chips, sit inside almost everything that runs on electricity and logic: cars, mobile phones, medical devices, power grids, weapons systems and the data centres that train artificial intelligence models. A modern economy simply cannot function without a reliable supply of them. That dependence would matter less if chips were made in many places by many competing firms, in the way that, say, textiles are. They are not. The most advanced manufacturing is concentrated in a small number of specialist facilities, run by a handful of companies, located in a small number of countries. This narrow base is what has turned semiconductors from an obscure industrial product into a subject of government strategy documents and diplomatic negotiation.
A concentrated and fragile supply chain
Making a leading-edge chip is one of the most complex manufacturing processes ever devised, requiring machinery, materials and expertise drawn from across the globe. Design software and intellectual property often originate in one country, specialised lithography equipment in another, raw silicon and rare gases from several more, and the actual fabrication in yet another. No single nation, including the largest economies, can currently do all of this alone. That interdependence used to be seen as a strength, spreading risk and cost across many partners. Disruptions in recent years, including pandemic-era shortages that idled car factories and delayed consumer electronics, showed the other side of that coin: a bottleneck at any one point in the chain can ripple through entire industries within weeks.
The geographic concentration is particularly stark at the cutting edge. The most advanced chips, the kind needed for high-performance computing and artificial intelligence, are fabricated by only a handful of firms worldwide, clustered mainly in East Asia. Governments elsewhere have become acutely aware that they rely on a small number of factories, in a region with its own geopolitical tensions, for components that underpin their economies and militaries.
Chips as a security and defence issue
Semiconductors are dual-use technology. The same processing power that runs a smartphone can guide a missile, encrypt communications or accelerate the machine learning systems now being built into defence and intelligence work. This has made chip supply chains a matter of national security rather than pure commerce. Export controls, once largely reserved for weapons and nuclear materials, have increasingly been applied to advanced chips and the equipment used to make them, as governments try to control who has access to the most powerful computing capability. This has, in turn, accelerated efforts by major powers to build up domestic manufacturing capacity, so they are not reliant on rivals or on regions vulnerable to conflict.
Where the UK fits in
The UK does not operate large-scale advanced chip fabrication plants, which require enormous capital investment and highly specialised infrastructure. Its strengths lie elsewhere in the chip ecosystem: chip design, where British-founded firms have had global influence, compound semiconductors used in power electronics and telecoms, and research carried out in universities and national laboratories. Successive UK governments have set out strategies aimed at strengthening these areas, supporting domestic design and research capability, encouraging investment in specialist manufacturing niches, and working with international partners to secure access to components that cannot realistically be produced at home. The emphasis has generally been on being a valued, secure link in the global chain rather than attempting self-sufficiency, which few countries can achieve.
Why the strategic shift is likely to endure
Even as supply pressures from any single disruptive event ease, the underlying vulnerabilities remain: a concentrated manufacturing base, long and complex supply chains, and the dual-use nature of the technology. Governments have responded with industrial subsidies, alliances between allied nations to coordinate investment and export rules, and closer scrutiny of foreign investment in chip firms. None of this guarantees resilience, since building new fabrication capacity takes years and enormous sums of money. But the underlying logic, that a country’s economic and military security now runs through a small number of factories making tiny slices of silicon, is unlikely to fade. Semiconductors have become infrastructure in the same sense as energy or transport networks, and are being treated accordingly.