How to build an AI startup in the UK

How to build an AI startup in the UK

May 26, 2026 · 46 min

About this episode

Nnamdi Emelifeonwu discusses his journey from a law firm to co-founding an AI-powered legal tech company in the UK.

Nnamdi Emelifeonwu left a top London law firm to set up one of the UK’s fastest-growing legal tech companies. He talks to host, Sir Richard Harpin, about how building a tool to help his visually impaired colleague to navigate complex legal documents led to co-founding Definely. It is an AI-powered legal tech platform designed to help lawyers access definitions, clauses and key information instantly without leaving the Word document they’re working on. It is used by some of the world’s leading law firms and global businesses and is now integrated into Anthropic’s Claude. Nnamdi shares the reality of becoming a founder, the challenges of raising investment, and how solving one deeply personal problem evolved into a multi-million-dollar AI business.   Themes include: The future of AI in the legal industry Building a startup from scratch Entrepreneurship, risk and resilience Scaling a B2B company Expanding into the US Starting a business in the UK Business Leader is a membership community for ambitious CEOs and founders of mid-sized UK companies, designed to help them grow with purpose through strategic support, peer-to-peer learning, expert coaching, and high-impact events…

People in this episode

Host: Sir Richard Harpin

Guest: Nnamdi Emelifeonwu

Topics covered

Mentioned in this episode

Organizations: Definely, Anthropic

Places: UK, London

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