Britain and Japan unveil £18 billion investment and tech pact

Britain and Japan moved to package more than £18 billion in investment and technology cooperation around offshore wind, advanced computing and industrial supply chains, with Keir Starmer and Sanae Takaichi presenting the deal as a bid for jobs as well as capital. The British government said the package could create tens of thousands of jobs and deepen a relationship already built around trade, science and strategic industry.

The largest single components were a Japanese five-year investment pipeline of more than £9 billion in infrastructure and financial services, and plans to unlock up to £9 billion for UK offshore wind projects. Ministers said the wind element could support 5.9 gigawatts of capacity across projects in Scotland and the Celtic Sea, tying the deal directly to Britain’s clean-energy buildout and to supply chains that reach beyond finance into ports, steel, cabling and grid infrastructure.

The two governments also planned a new technology partnership covering artificial intelligence, semiconductors and quantum computing. That points the relationship toward the sectors both sides see as strategic: not only energy transition, but also the technologies that will shape defence, manufacturing and digital resilience. Companies including Hitachi Energy, Rolls-Royce and Eisai were expected to announce investments and collaborations spanning power-grid expansion, nuclear technology and life sciences.

The agreement sat on top of a broader bilateral economic base. Starmer has said Japan is the UK’s largest inward investor outside the United States and Europe, sustaining 150,000 British jobs. UK government trade figures released in May put total UK-Japan trade in goods and services at £34.6 billion in the four quarters to the end of 2025, up 2.9% from a year earlier.

The new Frontier Technology Partnership also built on a sequence of earlier arrangements, including a Digital Partnership in 2022, a Semiconductor Partnership in 2023, Economic Security and Industrial Strategy Partnerships in 2025 and a Strategic Cyber Partnership in 2026. Those agreements rest on the 1994 UK-Japan Agreement on Cooperation in Science and Technology, giving the latest package a long institutional runway rather than the feel of a one-off announcement.

The timing sharpened the political value. The pledge came ahead of the G7 summit in France, where both governments were set to show they could pair alliance management with industrial policy. In January 2026, Starmer and Takaichi said they would work together on high-priority frontier-technology challenges, and a February package added multi-million-pound investment in UK life sciences gene therapy, joint quantum funding and a £6 million research programme for mobile coverage and digital infrastructure. Britain and Japan are now trying to turn that sequence into measurable jobs, stronger supply chains and a more durable economic partnership.