Legal AI has moved from novelty to procurement-line-item in under eighteen months. For UK solicitors, the question is no longer whether to adopt — it's which platform actually balances productivity gains with the UK GDPR, SRA and data-residency obligations your COLP will sign off on. This guide compares the tools UK firms are seriously trialling in 2026, with an honest read on where each one fits. Harvey AI — The enterprise default. Harvey is the platform most magic-circle and top-50 firms benchmark against. It excels at long-context contract review, drafting first-pass advisory memos, and litigation discovery summarisation. Pricing sits in the £££ band with bespoke enterprise contracts, and Harvey runs on Azure OpenAI with EU data residency available on request. Strengths: depth on M&A, regulatory and disputes workflows. Weaknesses: heavy implementation lift, and overkill for sub-30-fee-earner practices. Legora — The European challenger. Legora (formerly Leya) is Stockholm-built and has won meaningful UK mid-market share by being faster to deploy and noticeably cheaper than Harvey. It's strong on jurisdiction-aware research, multi-document review, and collaborative drafting inside a familiar tabbed interface. Data is hosted in the EU by default, with a clear DPA and sub-processor list — which makes the COLP conversation considerably shorter. Best fit: firms of 10–200 fee earners who want Harvey-class capability without an eighteen-month rollout. Robin AI — The contract-review specialist. If 80% of your AI use-case is NDAs, MSAs and supplier paper, Robin's playbook-driven review is hard to beat on cost-per-document. It plugs into Word, learns your firm's positions, and produces redlines a junior would otherwise spend two hours on. It is not a general-purpose research tool — but it doesn't pretend to be. Spellbook & Lexis+ AI — The incumbents catching up. Spellbook brings GPT-class drafting directly into Word and is popular with smaller commercial practices. Lexis+ AI (and Thomson Reuters' CoCounsel) bundle generative answers on top of authoritative UK case law and legislation — a meaningful advantage when hallucination risk is the blocker to partner sign-off. If your firm already pays for Lexis or Practical Law, these are the lowest-friction starting points. UK GDPR & SRA compliance — what to actually check. Before you sign anything, get four things in writing: (1) data residency — where prompts, outputs and training data are stored and processed; (2) a UK GDPR-compliant DPA naming the vendor as processor, with SCCs or the UK IDTA for any US transfers; (3) a no-training clause confirming your client data is never used to train base models; and (4) the vendor's sub-processor list, with notification rights when it changes. Harvey, Legora and Robin all publish this material; if a vendor won't, that's your answer. How to choose — a practical framework. Match the tool to the workload, not the brand. For high-volume contract review at fixed-fee practices, Robin or Spellbook usually pays back inside a quarter. For full-service commercial firms wanting one platform across research, drafting and review, Legora is the pragmatic 2026 pick. For top-50 firms with dedicated innovation budgets and complex matter types, Harvey remains the benchmark. Across all of them, the firms getting real ROI are the ones automating the workflow around the tool — intake, conflicts, follow-up, billing — not just the drafting itself. Where Orbit fits. We don't sell legal AI software — we build the automation layer that surrounds it: instant lead response, AI-qualified intake, calendar booking, and review collection. Pair any of the tools above with a 60-second follow-up system and the productivity gains compound. If you'd like a 20-minute walkthrough of how that looks for a UK firm of your size, book a call from our homepage.