Three months ago I wrote that the UK doesn't have an AI problem — it has a growth problem. The government was busy drafting a compliance bill while productivity hovered at 1.1% year-on-year and business investment trailed every G7 peer for the twenty-fourth time in thirty years. The argument was simple: stop legislating, start removing friction.

Six weeks ago, the strategy turned. The Technology Secretary, Liz Kendall, announced a £500 million Sovereign AI Unit — equity of up to £20 million per startup, a million GPU-hours each on the AI Research Resource supercomputer network, fast-tracked visas in one working day, and government help with procurement, data access and regulatory navigation. A £282 million Strategic Assets Grants Programme sits alongside it for shared infrastructure like high-value datasets and automated labs.

The first equity cheque went to Callosum, an AI infrastructure company. Six more got compute access: Prima Mente (biological foundation models), Cosine (world simulation), Cursive (agentic AI), Doubleword (sovereign inference), Twig Bio (engineering biology) and Odyssey (AI for national security).

This is the most concrete UK industrial-policy AI move in years, and on balance the right kind of move. It still deserves a careful grading, though, because the real risk here is that the fund succeeds at the wrong thing.

What the fund gets right

It prices speed over paperwork. Visas in a working day. Procurement fast-tracks. Help cutting through the regulatory pinball machine. This is the bit that matters most, and it's the bit Whitehall has historically been worst at. The biggest reason the UK has lost AI companies to the US, in the end, has surprisingly little to do with tax or capital. It's that decisions in Whitehall take six months and decisions in San Francisco take a week. If you've ever waited for a visa to clear while a competitor in Palo Alto hired the same person, you understand viscerally how much this matters. Speed is a competitive moat, and the fund finally treats it as one.

Compute, too, lands in the right place. A million GPU-hours per company on AIRR is the difference between training a credible foundation model and renting fragments of one. Britain has spent two decades excellent at AI research and second-rate at productising it. The gap has almost always been compute. Throwing a public supercomputer at the problem is precisely the kind of state investment that markets won't make and that makes everything downstream possible.

And it backs serious technical bets, not press releases. Callosum, Prima Mente, Cosine, Cursive, Doubleword, Twig Bio, Odyssey — the list is heavy on hard problems. Biology, world models, inference infrastructure, defence. These aren't chatbot wrappers or consultancy plays. Someone in the Sovereign AI Unit has been reading carefully and picking on technical merit rather than relationships. That alone is unusual enough to be worth noting.

What it still gets wrong

It doesn't fix why British AI is worth more in California. That, in the end, is the heart of the problem, and the announcement doesn't address it. Every one of those seven companies is, today, more valuable the day after it flips to a Delaware C-corp than the day before. The buyer pool is wider, the multiples are higher, the path to listing is shorter, and the option pool everyone competes for talent with is denominated in dollars. The British government can write a £20 million cheque and still be outbid two years later by a US acquirer paying £600 million for the same business. The pattern is well-rehearsed: DeepMind sold to Google. ARM relisted in New York rather than London. Mistral, on smaller GDP behind it, has done something Britain hasn't quite managed yet. The same UK business, listed or owned across the Atlantic, simply commands a higher price.

France's playbook of equity, compute and visas is the one the Sovereign AI Unit is copying. But France pairs it with €109 billion of AI infrastructure announced at the AI Action Summit, a deeper sovereign-cloud strategy through Mistral Compute, and at least the beginnings of a regulatory environment designed to make domiciling in Paris pay off. Britain hasn't done the harder thing: making the UK a more valuable home for a scaling AI company than the US is. Until that changes, this fund is a down-payment on companies the UK won't keep.

Scale is the other gap. £500 million is genuine money for seven startups. It's also less than 1% of what France committed in February 2025, and a rounding error next to the $100 billion MGX fund the UAE is now deploying. If this is meant as a focused bet on a handful of frontier companies, fine. If it's supposed to underwrite Britain's place in the global AI economy, then this is the opening bid, not the strategy.

And the fund funds builders, not buyers. I made a similar point about the Budget six months ago, and it applies here too. A country with strong frontier firms and a long tail of poorly-managed companies that won't or can't adopt frontier technology doesn't get richer from AI just because it has Callosum and Prima Mente. It gets richer when the average British firm uses what those companies build. I'm not sure how cleanly anyone can separate the two halves of the productivity problem, but the half the fund doesn't touch — whether the rest of the British economy actually adopts what gets built — is a big chunk of it. The instruments for that half look completely different: SME procurement reform, sector-specific implementation grants, tax relief for AI adoption rather than only for AI creation, and a serious push on management capability uplift. None of those are on the table.

How it scores

It's the right direction with the right instruments, at roughly a tenth of the right scale, and with the central trapdoor still wide open. The pivot from "we need a registration regime" in February to "here are seven equity cheques" in April is exactly the shift the case for action required, and anyone who argued the government should stop legislating and start unblocking — and I was one of them — has very little ground to be churlish about it now. But two months ago Britain was writing compliance bills and this month it's writing cheques. Neither, alone, is the answer to why so many of the businesses the UK wants to keep are worth more the moment they stop being British. That answer sits in the tax, listing and capital-gains environment Whitehall keeps avoiding.