AI-powered London law firm LawFairy has been authorised by the Solicitors Regulation Authority (SRA) to operate, calling itself the first “technology-only” practice in England and Wales built around “a fully deterministic legal model”.
LawFairy says it uses pre-validated legal rules rather than ‘probabilistic AI’ in order to deliver consistent outcomes, with a complete, auditable reasoning record. The firm says its platform uses a deterministic legal decision engine in the same way that a certified flight simulator uses decision logic to perform the same way with the same data inputs every time.
Writing on LinkedIn, LawFairy founder Raj Panasar, said: “At LawFairy, decisions grounded in law are governed by deterministic legal logic, with language models operating inside that structure rather than driving outcomes themselves. That’s what makes decisions traceable, explainable and suitable for high-stakes legal use.”
The firm is targeting areas of law governed by defined statutory tests, eligibility criteria, thresholds or time limits, where the AI platform can apply rules directly and consistently. One initial area of focus is immigration.
A LawFairy spokesperson explained: “Eligibility often turns on precise criteria: salary thresholds, government job classifications and strict residence calculations for settlement and citizenship. Small factual differences can change the outcome entirely.
“LawFairy applies those rules deterministically and produces structured eligibility assessments and reasoning packs. For clients, that means clarity and defensibility in decisions that affect the right to work, remain or settle.”
The same model, they said, could be extended to other rule-based regulatory areas where the consistent application of codified criteria is critical.
One commentator that GLP spoke to said that while the idea was not new, with pathfinders such as Professor Richard Susskind attempting to encode a system of rules into computing in the 1990s, the open-ended nature of law and language defeated the resources available at the time.
Panasar, a former partner at Hogan Lovells and Cleary Gottlieb, said: “The law contains vast areas governed by precise rules – statutory tests, defined thresholds and fixed eligibility criteria. These do not require discretion. They require disciplined, consistent application. Deterministic technology is designed precisely for that task.
“Authorisation demonstrates that our model, when structured around verifiable rules and robust governance, can meet the same regulatory standards as any other authorised firm. We believe it also opens regulated legal services to people who currently find them too costly or uncertain to pursue.”
For consumers, LawFairy says it aims to reduce cost and uncertainty at the outset by grounding assessments against defined legal criteria. While this may suit comparatively simple legal processes, where such a rules-based approach might well work, the range of legal questions LawFairy will be used to solve remains open.
Where more complex judgement is required, LawFairy says it will generate a structured triage analysis and a fully reasoned case file for transfer to a traditional law firm, changing how matters arrive: users would receive completed eligibility assessments, facts translated into structured legal analysis and an audited reasoning trail.
Nick Leale, of CM Murray, said the development would be “a test of the SRA’s confidence in such models and their ability to cast aside bias, avoid hallucinations and protect confidential data”.
He said: “The SRA will no doubt have intricately carved through how clients are informed of how the business provides legal services and protects data, and how the business is governed and the advice provided is overseen.”
Leale added: “Ultimately, law is fundamentally interpretative – apparent legal norms often have to be applied to unforeseen facts – the governance of such an innovative legal services provider will have to constantly have in mind the need to ensure there is a bridge linking the gap between legal text and rules and evolving real-world situations – however simple the relevant dispute may seem to be.”
The SRA‑regulated entity delivering legal services is LawFairy Services, while a separate company, LawFairy Ltd, develops and licenses the technology and is not itself SRA‑authorised.
In May last year, Kent-based Garfield.Law became the first AI-driven law firm to be approved by the SRA. It offers small- and medium-sized businesses the use of an AI-powered litigation assistant to help them recover unpaid debts of up to £10,000 through the English small claims court.
The greenlighting of LawFairy’s service comes as a recent report by MD Communications shows legal‑sector leaders view AI as both transformative and high‑risk.
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