The British Business Bank has provided $20 million to Ineffable Intelligence, the London-based artificial intelligence company, in a groundbreaking $1.1 billion seed round believed to be the largest in European history.
In a move that signals a tightening of the government’s industrial strategy on cutting-edge technology, the state-owned development bank has co-invested with the Sovereign AI Fund, the Treasury-backed vehicle set up to anchor strategically important AI companies on these shores. The Sovereign AI Fund has provided additional capital in addition to the bank’s contribution, although the exact figure was not disclosed.
The British checks are within a syndicate that reads like a who’s who of the capital of Silicon Valley. Sequoia, Lightspeed, NVIDIA, Index Ventures, Google, EQT, Evantic, Flying Fish, DST Global and BOND all joined the round, adding weight to the argument that the UK remains capable of attracting wealthy foreign investors to its homegrown tech champions, despite ongoing concerns about the country’s risk appetite.
Ineffable Intelligence is the brainchild of David Silver, the University College London professor widely regarded as one of the most influential reinforcement learning researchers of his generation. Silver previously led the reinforcement learning team at Google DeepMind and is credited with key work on AlphaGo, AlphaZero, AlphaFold and AlphaProof, the systems that have successively rewritten what machines were capable of in areas from board games to protein folding to mathematical reasoning.
His new company has set itself a deliberately bold mission: to create what Silver calls a “superlearner,” a system capable of discovering knowledge from its own experience rather than relying on the data people give it. If implemented, the technology would represent a major advance over today’s major language models, which continue to rely heavily on online training material.
For the British Business Bank, the investment is the latest in a steady series of AI commitments. The lender has now closed nine AI deals in the last twelve months, most recently backing autonomous driving company Wayve and conversational AI specialist PolyAI. The bank has also been a quiet, significant force behind the commercialization of UK academic research, supporting almost a quarter of all university spinout deals completed between 2022 and 2024.
Charlotte Lawrence, managing director of direct equity at the British Business Bank, described Silver as “a cross-generational talent who is consistently at the forefront of AI development.” She added: “Ineffable Intelligence has the potential to create a paradigm shift in our science and technology landscape, and we are incredibly excited to support him and his team in this endeavor.”
George Mills, the bank’s investment director, said the company was attacking “one of the most significant opportunities within AI,” pointing to potential applications that span advanced problem solving and new product development. “The UK is producing world-class AI talent and we look forward to helping strategically important companies grow and stay in the UK,” he said in remarks seen as a stark reminder of the government’s determination to stem the flow of British intellectual property to American owners.
Josephine Kant, head of ventures at Sovereign AI, was also optimistic. “Very few founders in the world could credibly set the goal of building a superlearner, a system that discovers new knowledge from its own experience rather than ours. David is one of them,” she said. “From AlphaGo to AlphaZero to AlphaProof, he has spent almost two decades transforming reinforcement learning from a research idea into the results on which the rest of the field is built. Ineffable is developed in the UK, and that’s important.”
The deal comes at a sensitive time for British technology policy. Ministers have repeatedly emphasized their desire to position the country as a global center for safe and sovereign AI development, but have faced criticism over the relative scarcity of late-stage growth capital available to scaling deep tech companies. A seed round of this size, anchored by domestic public capital and backed by the world’s most prolific venture capital investors, is cited by Whitehall as evidence that the strategy is starting to bear fruit.
For SME founders watching from the sidelines, the headlines seem far removed from their own funding reality. Still, the structural change is significant: the British Business Bank’s growing willingness to issue large equity checks to frontier technology companies, in conjunction with private capital, suggests a more interventionist stance that could, over time, impact a broader cohort of high-growth British companies.
