# Best AI Agencies for Team Extension in London

> 10 agencies. Top-ranked: Old St Labs, Pixelette Technologies, Vention.

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

## Ranked roster
1. **Old St Labs** — London, United Kingdom · €45-85/hr (directory-listed) · team 50-249 · founded 2020 · services: AI Development, AI Consulting · 10 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/old-st-labs
2. **Pixelette Technologies** — London, United Kingdom · €20-40/hr (directory-listed) · team 250+ · founded 2018 · services: AI Development, AI Agents, AI Consulting, Generative AI · 7 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/pixelette-technologies
3. **Vention** — London, United Kingdom · €45-85/hr (directory-listed) · team 1000+ · founded 2002 · services: AI Development, AI Consulting, AI Agents · 10 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/vention
4. **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
5. **Satalia** — London, United Kingdom · rate not published · team 50-249 · founded 2008 · services: AI Consulting, AI Development, AI Agents · 6 documented client engagements with source URLs · reviewed 2026-09-07 · https://www.aiagencies.eu/agency/satalia
6. **Marionete** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2016 · services: AI Consulting, AI Development · 6 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/marionete
7. **Opinov8** — London, United Kingdom · €45-85/hr (directory-listed) · team 250+ · founded 2017 · services: AI Consulting, AI Development, AI Agents, Generative AI · 6 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/opinov8
8. **Softblues** — London, United Kingdom · €45-85/hr (directory-listed) · team 10-49 · founded 2014 · services: AI Automation, AI Agents, AI Consulting, AI Development · 5 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/softblues
9. **N-iX** — London, United Kingdom · €45-85/hr (directory-listed) · team 1000+ · founded 2002 · services: AI Consulting, AI Development, Generative AI, AI Agents · 4 documented client engagements with source URLs · reviewed 2026-09-23 · https://www.aiagencies.eu/agency/n-ix
10. **Neurons Lab** — London, United Kingdom · rate not published · team 50-249 · founded 2019 · services: AI Consulting, AI Agents, AI Development, Generative AI · 2 documented client engagements with source URLs · reviewed 2026-08-04 · https://www.aiagencies.eu/agency/neurons-lab


## About this market
London's team-extension bench is mostly a front door. The multi-year embedded engagements documented here are real: Vention describes a five-person team on EliseAI's leasing assistant over four years, a Kafene team grown from two to seven engineers since November 2022, and three engineers over three years on Comet's experiment-tracking platform; N-iX has run Gogo's data team since January 2017; Marionete built Saxo Bank's streaming DataHub over a three-year partnership and an MLOps factory for AXA. The AI inside those engagements is thin: at EliseAI it is automated replies added during four years of database and security work, at Kafene it is Cursor and CodeRabbit, and the Gogo team is big data and BI. Opinov8's embedded work at FDJ Gaming Solutions UK is a betting-product takeover with its AI case studies anonymized, and Satalia, whose optimization engines have run at Tesco and PwC for a decade, publishes no engagement model.

The sorting question for a London buyer is geographic. Vention calls its London office a local point of contact with delivery from centers across Europe and Asia; N-iX is headquartered in Malta with delivery centers in Ukraine, Poland and India; Old St Labs delivers through teams in the Philippines and South Africa under UK leadership; Marionete staffs from London and Lisbon. The rate quoted and the person who runs your team day to day both follow from that, so ask where each named engineer sits, who among them has shipped LLM work, and who stays past the first year.

## Questions buyers ask

### How many AI agencies work with team extension in London?
10 agencies in our directory combine verified team extension client evidence with a London base. The current top-ranked are Old St Labs, Pixelette Technologies, Vention — 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 €20–130 per hour (median ~€65). Project totals depend on scope — the rate index at /rates breaks the computed bands down by region, country and team size.

### How is the team extension model verified?
Every agency here documents team extension work on its own site or in a published case study, describing the engagement structure rather than a service-list claim. We never infer the model from portfolio tone, so this list only contains agencies that operate team extension engagements deliberately.

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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