A junior solicitor at Pinsent Masons has been publicly admonished after using AI to draft two misleading letters to the High Court — letters that contained fabricated legal references which had no basis in the Insolvency Rules 2016. The judge ruled that the solicitor had “almost entirely outsourced the thinking process” to the AI programme. If a large city firm with significant supervision infrastructure can let this happen, every independent law firm in the country has reason to pay attention.
The Bigger Picture: AI Is Already Inside Your Firm
This isn’t a hypothetical future risk. AI tools — from Microsoft Copilot to ChatGPT to specialist legal drafting platforms — are already being used by fee earners at law firms of every size. The Pinsent Masons case is the first high-profile UK example of AI hallucinations causing direct regulatory harm, but it won’t be the last.
What makes this case particularly striking is the failure chain. It wasn’t just the junior solicitor who failed to check the AI’s output. A senior associate and a partner both reviewed and approved the letters without verifying the cited legal provisions. Critically, the AI itself warned the user to check the references — and that warning was ignored. This is a supervision failure as much as a technology failure.
For independent law firms and high street solicitors, the risk is arguably sharper than at large firms. Smaller teams mean fewer checks. Pressure to be efficient drives people toward AI tools. And if no one has set a firm-level policy on how those tools should be used, the outcome is exactly what happened at Pinsent Masons: well-intentioned use with serious consequences.
Pinsent Masons self-reported to the SRA, which the judge noted favourably. The firm received a public admonishment, covered extra costs for affected former clients, and had Irwin Mitchell take over representation. The self-reporting mitigated the outcome — but the reputational damage and regulatory record remain.
What Independent Solicitors Need to Know
The Pinsent Masons case reveals three specific risks that every firm must address now:
Hallucination is a feature, not a bug. Current large language models fabricate plausible-sounding citations, cases, and statutory provisions with complete confidence. There is no error message when the AI invents a legal reference. Any fee earner using AI to assist with legal drafting needs to understand this — and independently verify every reference before it leaves the office.
Supervision is your liability. If a partner signs off AI-assisted work without checking it, the liability does not sit with the technology provider. It sits with the supervising solicitor. The Pinsent Masons partner who approved the letter without checking the cited rule is a cautionary tale in professional responsibility under the SRA Code of Conduct.
The SRA is watching. The regulator’s enforcement approach to AI-related failures is still forming, but the direction is clear: firms that lack policies, fail to supervise, and fail to self-report will face harder consequences than those that demonstrate they have tried to get it right. Waiting until something goes wrong to think about AI governance is a position that is becoming harder to defend.
For regional law firms and independent solicitors, any free-to-use AI tool that fee earners are already using informally — without a firm-level policy — represents a live and active risk.
What Forward-Thinking Firms Are Already Doing
The firms getting AI adoption right are not banning it — they are governing it. Specifically:
Drafting written AI usage policies that define which tasks AI tools can assist with and which require full human drafting. Court correspondence, statutory interpretation, and regulatory advice are high-risk categories that should require explicit verification steps before sending.
Building verification into workflow. The rule is simple: any legal reference generated by AI must be independently confirmed against the primary source before it leaves the firm. Some practices are formalising this as a mandatory checklist step in their matter management systems.
Training fee earners on hallucination risk. This does not require expensive external courses. A 30-minute internal session covering what AI gets wrong and why can fundamentally change how people interact with these tools.
Using AI in lower-risk contexts where hallucination is less dangerous — drafting client-facing summaries, structuring documents, generating marketing content, or supporting business development activities where factual precision can be easily checked.
The distinction is not AI versus no AI. It is governed AI versus ungoverned AI. The former is a competitive tool. The latter is a regulatory risk.
How This Connects to Growth and Digital Visibility
Here is the angle that often gets missed: used correctly, AI is a genuine competitive advantage for independent law firms. The Pinsent Masons case is evidence of the reverse — a firm’s AI failure happened because governance could not keep pace with adoption.
For high street solicitors, a clear AI policy is not just risk management. It is a differentiator. Clients are increasingly asking about AI use. Firms that can explain a thoughtful, supervised approach to AI will build more trust than those who either use it recklessly or refuse to engage with it at all.
AI also plays a growing role in how clients find solicitors. GEO — Generative Engine Optimisation — refers to ensuring your firm’s content is structured and cited by AI search engines like Perplexity, ChatGPT Search, and Google’s AI Overviews. Independent law firms that invest in well-structured, factual, authoritative content will increasingly appear in AI-generated recommendations to prospective clients. That is the positive application of AI for law firm growth, and it is happening right now.
The governance risk and the growth opportunity are two sides of the same coin. Getting the internal AI policy right on the risk side frees you to pursue the upside — better visibility, stronger content, and a marketing approach built for how clients search in 2026.
If your firm wants to understand how AI search is changing the way clients find solicitors — and how to position your practice to benefit — the GrowwithQS team works with independent law firms across the UK on exactly this. Explore our AI SEO service for law firms to see how forward-thinking solicitors are building visibility in the age of AI search.
