Best SaaS & B2B AI Agencies in London (September 2026)

Client evidence: 8 documented clients overall

Best for: Pharma, research and public-sector buyers with an NLP problem on unstructured documents that has to survive review.

Elsewhen is a London product consultancy working with technology and financial-services companies, pairing product design and engineering with AI and cloud delivery.

iCentric Agency is a London and Bedfordshire digital consultancy building custom platforms for enterprise clients, with machine-learning pricing, document processing and agentic tooling among its published specialisms.

Client evidence: 5 documented clients overall

Best for: Organizations wanting a private, self-hosted generative AI workspace over their own documents rather than a public LLM.

Hexploits is a London software consultancy that builds AI platforms and cloud infrastructure for startups, taking product engineering from architecture through to production hosting.

Vention is a software engineering firm with a London office, running an AI Center of Excellence alongside its platform practice. Its AI work spans computer vision, retrieval systems, and agent development.

NOVOS is an employee-owned London e-commerce growth agency running search, digital PR and an AI-search practice aimed at getting retail brands cited in generated answers.

Transparity is a UK Microsoft partner running an AI consulting practice across agentic AI, Copilot Studio, and Azure AI Foundry. It holds the AI Platform on Microsoft Azure Specialisation and Microsoft Frontier Partner status.

Pixelette Technologies is a London technology firm founded in 2018, building computer-vision and data-automation systems alongside its wider engineering practice.

Softblues is a London AI implementation firm founded in 2014, building multi-agent pipelines, retrieval-augmented support agents, and voice agents for mid-market companies. It is a registered Anthropic Partner Network member.

Found is a London performance-marketing agency with a data and AI practice covering AI-search visibility, data science and marketing automation, built on its own Luminr and Everysearch tooling.

Engineering services group with a dedicated data, AI and machine-learning practice covering generative AI consulting and implementation, AI agents and MLOps. London office; registered in Malta with delivery centres across Ukraine, Poland, Bulgaria, Romania, Sweden, India and Colombia.

Marionete is a London data and AI engineering consultancy building enterprise data platforms, self-service data science environments and machine-learning systems for banks, brokers and industrial groups, with a nearshore delivery office in Lisbon.

Old St Labs is a London product studio founded in 2020, building web and mobile applications with an AI software development line. It works largely with early-stage and scaling companies.

Opinov8 is a London-headquartered engineering firm founded in 2017, running an AI consulting and data practice and its own agent deployment platform alongside cloud and modernization services.

Molo Agency is an AI automation shop on the northern edge of London building agents and workflow automation into the systems small and mid-sized businesses already run.

ClickSlice is a London search agency running an answer-engine and generative-engine optimization practice alongside conventional SEO for small and mid-sized retailers.