Westlaw UK has been the default legal research database for UK solicitors for decades. It's comprehensive, authoritative, and expensive. The honest question in 2026 is whether most UK firms are getting value from that expense, or paying for depth they rarely need.
| | Westlaw UK | Writford Research | |---|---|---| | Coverage depth | Comprehensive, all law reports and journals | Current legislation and BAILII case law | | AI-assisted answers | Limited | Yes, synthesised with citations | | Price | Premium subscription | Included in Writford subscription | | Best for | Deep research on contested points | Day-to-day legal research questions | | Court citation standard | Neutral citations and report series | BAILII references (free sources) | | Contract review integration | No | Yes |
What Westlaw genuinely does that AI tools don't
Westlaw's coverage of case law is unmatched. It includes every major law report series, unreported decisions that aren't on BAILII, full legislative history going back further than any free source, and comprehensive secondary materials, Halsbury's Laws, Sweet & Maxwell practitioner texts, legal journals, integrated into the same interface.
For research that requires that depth, obscure older decisions, comprehensive case law searches on contested points, legislative history tracing over decades, Westlaw is still the most complete UK source available.
The citations Westlaw produces are also the accepted standard for UK court documents. When you're citing in correspondence, advice notes, or submissions, Westlaw's neutral citations and report series references are what courts and practitioners expect.
What AI legal research tools offer that Westlaw doesn't
Westlaw returns documents. You search, you get a list of cases or statutory provisions, and you read and synthesise them yourself. This is how legal research has always worked, and it's fine, but the synthesis step is time-consuming and requires you to already have a sense of where to look.
AI research tools accept natural language questions and do the synthesis for you. "What's the current position on constructive dismissal where an employer unilaterally changes shift patterns?" returns a synthesised answer with citations, not a list of documents to read. For questions you could phrase clearly, this is significantly faster than a Westlaw search.
AI tools also cost considerably less. A Westlaw firm subscription is priced for practices with research-intensive volume. AI research tools, including Writford, are available at a fraction of the monthly cost, per user.
The realistic split for most UK firms
This is the honest version: most day-to-day legal research for small and mid-sized UK firms doesn't require Westlaw's depth.
Checking the current state of a statutory provision, finding the leading authorities on a common point, verifying a limitation period, checking SRA guidance on a compliance question, all of this can be done from legislation.gov.uk, BAILII, and the SRA's own publications. AI tools that retrieve from those live sources give you access to the same primary materials, faster.
The research that genuinely needs Westlaw is the minority: complex litigation involving obscure authorities, comprehensive legislative history, specialist practitioner text research. That research happens on some matters, not on most.
Many UK firms would get better value from a combination of an AI research tool for day-to-day queries and occasional Westlaw access through a law library, professional membership scheme, or single-user subscription for the cases where full depth is needed, rather than paying for firm-wide Westlaw access that most fee-earners rarely use at full depth.
The verification point
One thing Westlaw and good AI research tools have in common: they both give you something to verify. Westlaw links to real documents; so does an AI tool that retrieves from live UK sources.
The tools that don't do this, general-purpose AI that generates from training data, are the ones that create professional risk. The comparison isn't really Westlaw vs AI. It's retrieval-based tools (Westlaw, AI tools with live UK retrieval) vs generation-based tools (ChatGPT, Claude used as a chatbot). The professional obligation to verify your research applies in all cases, but it's only achievable if the tool gives you real sources to verify against.
Writford's Research mode retrieves from live UK sources, legislation.gov.uk, BAILII, SRA guidance, and provides clickable citations. For the day-to-day research that makes up most of a UK solicitor's week, that's the relevant comparison.