# Best AI Agencies for Public Sector in London

> 3 agencies. Top-ranked: Fast Data Science, Kortical, Nebuli.

Canonical page: https://www.aiagencies.eu/for/government/london
Generated: 2026-09-17 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold.

## Ranked roster
1. **Fast Data Science** — London, United Kingdom · €175-260/hr (directory-listed) · team 2-9 · founded 2018 · services: AI Development, AI Consulting · 8 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/fast-data-science
2. **Kortical** — London, United Kingdom · €85-130/hr (directory-listed) · team 2-9 · founded 2016 · services: AI Consulting, AI Development, Generative AI · 8 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/kortical
3. **Nebuli** — London, United Kingdom · rate not published · team 2-9 · founded 2019 · services: Generative AI, AI Development, AI Consulting · 5 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/nebuli


## About this market
Public-sector AI in London, on this page, is not the large consultancies. The firms here are small teams carrying named government work.

Fast Data Science built the Information Commissioner's Office an email classifier trained inside an isolated environment on data that could not be retained, and its Clinical Trial Risk Tool for the Gates Foundation is peer-reviewed, publicly deployed and MIT-licensed. Kortical's platelet supply-and-demand work for NHS Blood and Transplant reports a 54% reduction in expiries across 40 blood products and 15 distribution hubs. Nebuli deployed a private, self-hosted generative AI workspace for the UK Sports Institute and was invited to review the government's AI regulation white paper.

The trade-off is visible in the headcounts. Each of these is a small team, so procurement should establish who actually delivers, what documentation the engagement leaves behind, and what happens to the system after they leave.

## Questions buyers ask

### How many AI agencies work with public-sector in London?
3 agencies in our directory combine verified public-sector client evidence with a London base. The current top-ranked are Fast Data Science, Kortical, Nebuli — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid.

### How much does an AI agency cost in London?
Published rates across this page's agencies run €85–260 per hour (median ~€163). Project totals depend on scope — the rate index at /rates breaks the computed bands down by region, country and team size.

### How is public-sector experience verified on this page?
Each listed agency has at least two documented, named public-sector clients — published case studies or engagement descriptions our research actually read, with source URLs stored per client. Logo walls without published evidence carry no weight, which is what separates this list from self-declared directories.

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Source: AIAgencies.eu — the curated register of European AI agencies. Rate provenance: "agency-confirmed" = disclosed via submission or claimed profile; "directory-listed" = Clutch or two agreeing B2B directories (lone unverified sources are never written). Full method: https://www.aiagencies.eu/methodology · Rate index: https://www.aiagencies.eu/rates