Microsoft has unveiled its largest ever UK investment, committing £22 billion over the next four years to build Britain’s biggest artificial intelligence supercomputer and expand its data centre network. The announcement, timed to coincide with President Trump’s state visit, dwarfs other Big Tech pledges and forms the centrepiece of £31 billion in new US-led tech investment. The GPUs will be distributed through US firm CoreWeave and NScale, with CoreWeave itself investing £1.5 billion in new UK capacity. The UK version is a three-way partnership between Nvidia, NScale and OpenAI, which will use up to 31,000 GPUs by 2026 to run its top-tier models under UK data rules. “The UK must not allow its digital future to be dictated by a small coterie of US Big Tech firms,” they said.