The £20bn sovereign AI letter is a bid for the market it describes

An open letter hosted on the website of Cosine, a British AI lab, asks the UK government to commit more than £20bn over five years to sovereign AI compute, power, data center capacity and network infrastructure. The letter page carries no date. City AM, which reported the letter on 28 September, says it is addressed to Andy Burnham, the prime minister, and Kanishka Narayan, the AI minister, and was coordinated by Cosine.

The signatories are the people who would build what the letter describes. They include Brendan Mooney, CEO at Kainos; Colin Bannon, CTO at BT; Matt Harris, managing director, UK, Ireland, Middle East, and Africa at HPE; Craig Wilson, UK CEO at Sopra Steria; and Ben Jarvis, chief technology officer at Telefónica Tech UK. Executives from Leonardo UK, OneAdvanced, PA Consulting, Baringa, Advai, Era4, Oaklin Consulting and Xcelo sign too, as does Kainos’s chief AI officer.

The letter has eight asks. Beyond the money, it wants a cross-party 10-year Sovereign AI Strategy, a fast-track sovereign procurement route and a Sovereign AI Capability Plan published within 90 days. One line is shorter than the rest: “No mission-critical public service or critical national infrastructure should depend on a single model, provider, or cloud stack.”

Read the signatory list against the asks and the letter is two documents. One is a resilience plea. The other is a bid, from the vendors and integrators who sell to government, for a £20bn market to be created and reserved. Public bodies should read it as the second, because that version changes what they are allowed to buy and whom they may buy it from.

Where the money goes now

Artificial intelligence in UK public procurement, 2022 to 2026, a report published on 15 September by Seamus White, founder of the tender-alert service BidSkim, counts 2,083 AI-related procurements by 616 public bodies between January 2022 and August 2026, with 1,506 awards carrying a published value of £1.84bn. According to the report, UK suppliers won 998 of those awards but hold £643.7m, while suppliers headquartered or owned overseas won 501 and hold £1.19bn: two-thirds (66%) of the contracts against a little over a third (35%) of the money. Palantir alone holds £552.8m across 16 contracts, 30% of the total.

The government’s existing commitments are small by comparison. Sovereign AI, whose first backing was announced on 16 April, is described on gov.uk as a £500m fund to back homegrown AI founders; City AM adds that the first competitions under a £100m procurement scheme for smaller British AI companies opened in August. The letter asks for 40 times the first figure.

The remedy in the letter is not a subsidy to buyers. It is a reshaping of supply: procurement guarantees, co-investment, a fast-track route and government as first customer. Every one of those routes money to suppliers that can call themselves sovereign. BidSkim also finds that small and medium-sized enterprises won 53% of valued awards but hold 17% of the value (£303.9m). BT, HPE, Kainos and Sopra Steria are not among them. The firms asking for the £20bn are the firms sized to receive it, and Cosine, which hosts the letter, is not a neutral convener either. The SMEs that win the most awards, such as Beam, VivaCity and Voicescape, are not on the list.

The clause that costs nothing

The £20bn is a request, and requests of that size rarely arrive whole. The single-provider clause is different. It costs nothing to adopt and can be written into procurement policy rather than a budget. It is the part of the letter most likely to survive contact with government.

If it does, every public body running a mission-critical service or critical national infrastructure (CNI) becomes a two-supplier buyer by rule. A department, trust or council running one hyperscaler and one model vendor would be in a configuration it is no longer permitted to run alone. The second model, provider and cloud stack have to come from somewhere, and so does the work of making them interoperate, fail over and pass assurance. Buyers pay for it; the integrators who signed are placed to sell it.

The letter wants the fast-track procurement route to carry evidence thresholds, audit trails, post-award transparency and ongoing assurance monitoring. Jarvis makes the case from Telefónica Tech’s side: “Sovereign capability is what makes AI viable for those sensitive and critical use cases,” he says, arguing that in regulated industries the test is whether a decision can be evidenced in front of a regulator or a court.

A stack the buyers did not design

Look at who signed and a stack appears: BT for the network, HPE for the compute, Kainos and Sopra Steria for delivery into departments, Telefónica Tech for running AI inside regulated industries, Leonardo for defense. Wilson’s statement says a clear roadmap for AI sovereignty will be vital to shaping Britain’s global position for decades. A capability plan published within 90 days would cover compute, procurement, resilience, strategic sectors and long-term funding, and the firms that wrote the ask will have had first say on it.

UK technology firms of every kind have three positions, and the letter forces the choice. They can qualify as sovereign suppliers themselves, however the capability plan ends up defining the term, and pass the assurance regime the letter describes. They can be the second supplier the single-provider rule creates a slot for on every CNI account. Or they can keep selling the stacks the letter wants government to stop depending on alone, and watch the assurance and integration margin go to the firms on the signatory list.

The signatories have asked for £20bn and may get less. What they have already done is write the procurement rule they would like to sell against. Sovereignty, in procurement terms, means a second supplier. Public bodies should choose theirs before the firms that wrote the rule choose for them.