# Best Public Sector AI Agencies in London

> 6 agencies. Top-ranked: Faculty, Fast Data Science, Transparity.

Canonical page: https://www.aiagencies.eu/industries/public-sector/london
Generated: 2026-09-28 · Curated by Gabor Kiss · No paid placements — inclusion, score, and rank are never sold.

## Ranked roster
1. **Faculty** — London, United Kingdom · rate not published · founded 2014 · services: AI Consulting, AI Development, AI Automation, AI Agents · 3 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/faculty-ai
2. **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
3. **Transparity** — London, United Kingdom · €85-130/hr (directory-listed) · team 250+ · founded 2015 · services: AI Consulting, AI Development, AI Automation, AI Agents · 8 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/transparity
4. **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
5. **Mercury Labs** — London, United Kingdom · €85-130/hr (directory-listed) · team 10-49 · founded 2018 · services: AI Consulting, AI Development, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/mercury-labs
6. **Contra Agency** — London, United Kingdom · €130-170/hr (directory-listed) · team 10-49 · founded 2000 · services: AI SEO · 1 documented client engagement with source URLs · reviewed 2026-08-06 · https://www.aiagencies.eu/agency/contra-agency


## About this market
Public-sector AI in London is bought through frameworks, and the roster reflects who has been through one. Faculty designed the NHS AI Lab's model-validation process, which is the part of the job that decides whether a clinical model is allowed to matter at all. Mercury Labs is an approved supplier on the Crown Commercial Service AI framework and names four government departments—the Department for Education, IfATE and Skills England among them—plus multi-year delivery on Innovate UK's Workforce Foresighting Hub. Fast Data Science has worked for the Information Commissioner's Office and the World Health Organization. Nebuli built for the UK Government's Office for AI and deployed a private generative workspace at the UK Sports Institute. Contra Agency covers communications.

Government buyers carry a documentation burden private clients never see, and the framework route rewards suppliers who have already produced it. Ask for the handover package from a past public engagement—model documentation, evaluation records, runbooks—and ask what the department was able to operate without the supplier afterward.

## Questions buyers ask

### How much do Public Sector AI agencies in London charge?
Of the 6 Public Sector AI agencies on this page, 4 publish complete hourly rate ranges. They range from €85 to €260, with a median around €129. Across the register, rated agencies in London bill €65–110/hr (19 rated).

### Which are the top-rated Public Sector AI agencies in London?
Based on our editorial scoring (portfolio quality, business credibility, and case study depth), the top-ranked Public Sector AI agencies in London are Faculty, Fast Data Science, Transparity. See the full review on each agency's profile.

### What other industries do London Public Sector agencies serve?
Beyond Public Sector, the most common cross-industry experience among these agencies is Healthcare (5 of 6 agencies). Notable examples include Faculty, Fast Data Science, Transparity.

### How recent are these Public Sector AI agency reviews?
All 6 agencies on this page were editorially reviewed between Aug 4, 2026 and Sep 23, 2026 — the most recent being Mercury Labs. See our review methodology for how scores are calculated.

### What's the smallest team size available for public sector in London?
Fast Data Science, Nebuli are the boutique studios (under 10 people) on this page, ideal for projects needing senior-level attention without large-team overhead.

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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