Law is one of the professions where AI is both most useful and most dangerous. Used carefully it removes hours of drafting; used carelessly it produces fabricated case law and confidentiality breaches. Here's the practical, honest picture for a small UK firm.
Start with the two hard limits
Everything else in this guide sits inside these.
1. Client confidentiality is absolute
Client information must not go into a consumer AI tool. Your duty of confidentiality doesn't have a "but it saved me time" exception, and free consumer tools offer no adequate protection. Work generically, or use a properly contracted business-grade or legal-specific tool with your firm's approval.
2. AI fabricates case law, confidently
This is not theoretical. There are well-publicised instances internationally of lawyers filing documents containing citations that simply did not exist, produced by AI and not checked. The output looks entirely plausible — correct format, realistic party names, sensible-sounding judgments — and is fiction.
The rule that follows: never rely on AI for legal authority. Every case, statute and citation must be verified in a proper legal research source. AI can help you structure and express an argument; it cannot tell you what the law is.
Where AI genuinely helps a small firm
Drafting standard correspondence
Client care letters, chasers, appointment confirmations, updates. Generic templates drafted quickly, then populated with client detail by you.
Prompt — client letter template
Draft a template client update letter for a UK law firm, for use in [type of matter], covering: what has happened since we last wrote, what happens next, what we need from the client, and expected timescales. Professional but warm, plain English, avoiding legalese where possible. Leave clear placeholders for all client-specific details — do not invent any facts.
Turning legal language into plain English
Arguably the highest-value use. Clients understanding their own matter reduces calls, complaints and anxiety.
Prompt — plain English explanation
Rewrite this explanation so a client with no legal background can understand it clearly. Keep it accurate and don't oversimplify to the point of being wrong. Short sentences, no Latin, explain any term that must be kept: [paste your own generic explanation, no client details].
Summarising long documents
Useful — with the confidentiality caveat firmly applied. For documents that are public or non-confidential, or within an approved secure tool, summarising a long judgment or a lengthy report into key points saves real time. Always read the original before relying on the summary for anything that matters.
Structuring arguments and first drafts
AI is good at organisation. Give it your own reasoning and ask it to structure it clearly, identify gaps, or argue the other side so you can test your position.
Prompt — stress-testing your argument
Here is the outline of an argument I intend to make: [paste your own generic outline]. Act as opposing counsel. What are the weakest points? What would you attack first? What have I not addressed? Do not cite any cases or authorities — I only want the structural critique.
The instruction not to cite anything is important — it removes the main risk while keeping the useful part.
Business administration
The non-legal half of running a firm — marketing, website copy, recruitment adverts, internal procedures, chasing unpaid invoices — carries none of the same risk and is where many firms find the easiest early wins. See chasing unpaid invoices and drafting job adverts.
What AI must never do in a law firm
- Provide legal advice, to you or to a client
- Be the source of any case, statute or citation
- Process client confidential information in an unapproved tool
- Determine anything with limitation, deadline or filing consequences
- Produce anything that leaves the firm without a solicitor reading and owning it
Your professional obligations still apply
Using AI changes nothing about your duties — competence, confidentiality, supervision and acting in the client's best interests all apply exactly as before. A document produced with AI assistance is your work, with your name on it, and your responsibility. Check your firm's insurer's position too; some now ask about AI use.
Practical steps for a small firm
- Write a short AI policy — what's permitted, what isn't, which tools. See a small business AI policy example
- Decide on approved tools — a properly contracted business tier at minimum
- Start with non-client work — marketing and admin, to build confidence safely
- Train everyone, including support staff, on the confidentiality rule specifically
- Verify everything — build the habit before it's tested
- Consider legal-specific tools if volume justifies it — built with confidentiality and citation accuracy in mind
The honest cost-benefit
For a small firm, the realistic gain is several hours a week on drafting, correspondence and admin — meaningful in a business where time is literally the product. The realistic risk, if handled badly, is a confidentiality breach or a fabricated citation reaching a court. Both are entirely avoidable with clear rules that everyone actually follows, which is why the policy and training matter more here than in almost any other sector.
This is general guidance on using technology in a business context, not legal or regulatory advice. Your own professional obligations and your firm's regulatory position govern.
Running a firm and want this done properly?
We help professional services businesses set rules staff actually follow. AskColin gives small businesses low-cost monthly support with one-to-one help whenever you need it — so when you're stuck on a real job, there's someone to ask. Practical, jargon-free, built around how you actually work.
Get one-to-one AI support for your businessFrequently asked questions
Can solicitors use ChatGPT?
For non-confidential work like marketing, admin and generic templates, yes. Client confidential information must not go into a consumer AI tool — use a properly contracted business-grade or legal-specific tool with your firm's approval, or work entirely generically.
Does AI make up case law?
Yes, confidently and convincingly. There are well-publicised instances of lawyers filing documents containing citations that did not exist. The output has correct formatting and plausible party names but is fiction. Never rely on AI for legal authority — verify everything in a proper research source.
What can AI safely do in a law firm?
Draft standard correspondence templates, translate legal language into plain English for clients, structure and stress-test your own arguments, summarise non-confidential documents, and handle the business side — marketing, recruitment, invoice chasing and internal procedures.
Does using AI change a solicitor's professional obligations?
No. Competence, confidentiality, supervision and acting in the client's best interests all apply exactly as before. A document produced with AI assistance is your work with your name on it. It's also worth checking your insurer's position, as some now ask about AI use.
Should a small law firm have an AI policy?
Yes — it matters more here than in most sectors. Cover what's permitted, what isn't, which tools are approved, and train everyone including support staff specifically on the confidentiality rule before anyone starts using AI on client work.