Best SaaS & B2B AI Agencies in the UK (August 2026)

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

Client evidence: 2 documented clients overall

Best for: Teams with a model that works in a notebook and needs to run, and keep running, in production.

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: 3 documented clients overall

Best for: Startups needing an agent system designed rather than assembled, from a shop whose wider client list runs to UNICEF and Erasmus MC.

Client evidence: 2 documented clients overall

Best for: Early-stage software companies adding an AI feature that has to work on day one of the pitch.

Client evidence: 3 documented clients overall

Best for: SMEs with one well-defined machine-learning problem who want a senior practitioner on it directly.

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

Catalyst Marketing Agency is a Birmingham lead-generation agency with London and Dubai offices, running search, content and paid media with a generative engine optimization practice for UK mid-market clients.

Blueberry Consultants is a Birmingham custom software consultancy building AI features into business applications, with its own model-routing, speech-to-text and retrieval tooling.

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.

Fast Data Science is a London natural-language and machine-learning consultancy building text-analysis and predictive models for health, pharma and research clients, with an AI due-diligence 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.

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.

B13 AI is a Birmingham software company working out of STEAMhouse, building custom platforms and AI features for healthcare, industrial research and B2B clients.

App Web Dev is a Manchester practice building autonomous agent systems and workflow automation for UK businesses, run by a single founder who brings in collaborators per project.

Kainos is a Belfast-headquartered digital services company whose data and AI practice builds machine learning and generative AI for government, healthcare and commercial clients.

Nebuli is an independent London studio building generative-AI workspaces, knowledge systems and responsible-AI tooling for public bodies, research institutions and enterprises.

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.