Best GEO and AI SEO agencies in the UK (2026)

The best GEO or AI SEO agency for your business is the one whose strengths match your sector and how much of the work you want done for you. There isn’t a single winner, so this list doesn’t pretend there is. It covers 12 UK agencies with a dedicated generative engine optimisation (GEO) or AI search service, in alphabetical order, with what each one publishes about its approach and what to check before you sign.

Castle is one of the 12, and we say so plainly where we appear. We’ve described ourselves the same way as everyone else: by what our own site says and what we can show, with an honest note on where we’re not the right fit.

How we chose these agencies

To make the list, an agency needed three things, all checked on its own website on 2 November 2026:

1. A UK base. An office or registered address in the UK.
2. A dedicated GEO, AEO or AI search service. A service page describing the work, not a blog post or a line in a footer.
3. A published approach. Some description of how they do it: audits, content, technical work, digital PR, tracking.

We haven’t been paid by anyone on this list, and we haven’t ranked anyone first. Every agency’s website was opened and checked. Where we’ve repeated a claim, it’s because the agency’s own site makes it, and we say so. We couldn’t independently verify client results for anyone, including ourselves, so treat every figure below as the agency’s own reporting.

We also dropped two agencies that appeared in earlier versions of our lists. Blue Array’s site blocked our checks on the day, so we couldn’t confirm its current service page first-hand, and to keep the list to a sensible length we’ve left out Quirky Digital, whose GEO service page is live and worth a look for smaller businesses. Neither omission is a judgement on their work.

If you’re new to the terms, our guide to what GEO is and the AI search glossary cover the vocabulary. GEO, AEO and AI SEO overlap heavily, and most agencies below offer all three under one name or another.

The 12 agencies at a glance

Castle

Best for: businesses that want GEO, AEO, SEO and paid media handled by one team, and specialist sectors that need expert-led content.

Where: Mann Island, Liverpool. Disclosure: this is us.

Castle was founded in 2014 and works with businesses across the UK. Our GEO agency service covers an audit of how AI models describe your brand, entity and knowledge signals, content that AI tools can quote, third-party evidence such as reviews and digital PR, competitive share of voice, and ongoing monitoring. Our AI SEO agency team runs that work alongside technical SEO, Google Ads, Meta Ads and web development, which suits firms that don’t want to buy four disciplines separately and manage the gaps between them.

Published evidence: our HNK Solicitors case study reports AI-search citations rising from 38 in January 2026 to 163 by August 2026, with the site appearing in 68 Google AI Overviews (Ahrefs data). Our Clatterbridge Private Clinic case study covers medically reviewed, consultant-led content and reports 12 AI citations for North West private cancer care questions.

Honest notes: we’re a full-service agency that added GEO, not a pure-play GEO specialist. Our own case studies say AI search volumes are still small and attribution is imperfect. If you want to test us before committing, we offer a free AI visibility audit.

Charle

Best for: Shopify and ecommerce brands.

Where: London and Manchester, with a New York office.

Charle is a Shopify-focused agency, and its GEO service for ecommerce builds on that. The page describes entity-based content, structured data and product schema, digital PR for citation building, and monthly tracking of citations and brand mentions across ChatGPT, Perplexity, Google AI Overviews and Copilot. It also says GEO builds on SEO rather than replacing it, which is the right framing.

Honest notes: the process includes “chunk-level content restructuring”. Google’s guide to optimising for generative AI search lists chunking as something you can ignore for Google, so ask what that work is for and which platforms it’s aimed at.

ClickSlice

Best for: buyers who like a claim they can check themselves.

Where: Hoxton, London. Founded by Joshua George.

ClickSlice offers GEO services alongside AEO, a GEO audit and AI search marketing. Its GEO page states that when someone asks ChatGPT for the best SEO agency in London, ClickSlice appears first in the recommendations. We like that claim because it’s falsifiable: you can test it in thirty seconds.

Honest notes: AI answers change from one run to the next. SparkToro’s research found less than a 1 in 100 chance of ChatGPT giving the same list of brands twice across 100 runs, so run the prompt several times before drawing a conclusion, whichever agency you’re checking.

Digital Landscope

Best for: Scottish businesses and smaller firms that want a hands-on team.

Where: just outside Glasgow.

Digital Landscope describes itself as a UK AEO/GEO and SEO agency and says it’s a small team based near Glasgow, working with clients across the UK and beyond. It publishes AEO/SEO packages, offers AEO and SEO audits, and has case studies on its site covering AEO work for B2B and manufacturing clients. It also runs a separate AEO-focused website.

Honest notes: a small team suits businesses that want direct access to the people doing the work. If you need large-scale digital PR or enterprise reporting, ask how that’s resourced.

Found

Best for: larger brands that want GEO joined up with data and digital PR.

Where: Hatton Garden, London, with a New York office.

Found’s GEO service covers audits of how brands appear in generative answers, entity and schema work, citation analysis and digital PR. It sits alongside the agency’s named Everysearch methodology and its own Luminr platform. Building your own tool is a bigger commitment than adding a service page, and that investment is real.

Honest notes: the GEO page calls Found “the #1 GEO agency”. That’s the agency’s own description, not an independent ranking. Ask how Luminr reporting connects to revenue and which data you can export if you leave.

Hallam

Best for: integrated search and brand strategy.

Where: Nottingham and London.

Hallam’s AI search service combines technical SEO, conversational content strategy and digital PR aimed at earning citations. It describes two proprietary tools: Share of LLM benchmarking and a Citation Optimisation Framework. The page also states that Hallam won the European Search Award for best LLM adoption and integration by an agency in 2026.

Honest notes: GEO is one service in a broad agency rather than the whole business. That’s a strength if you want it integrated with everything else, and less so if you want a pure specialist.

Impression

Best for: mid-market and enterprise brands that want GEO measured against revenue.

Where: Nottingham, London and Manchester.

Impression’s GEO agency page explains that it tracks brand mentions, citations and sentiment across a set of prompts per topic, and reports acquisition and conversion metrics alongside them. It publishes a GEO case study with Tensar, reporting 1,793 AI Overview citations (Ahrefs) and 47,604 organic clicks from AI Overview keywords (Search Console) over a year.

Honest notes: a named case study with sources for each number is more than most agencies offer. As with any large agency, ask who’ll actually work on your account and how much of their time you get.

NeuralAdX

Best for: buyers who want published prices and published tracking.

Where: London. Founder and CEO Paul Rowe.

NeuralAdX is a GEO specialist, incorporated in March 2025, with an 11-factor GEO methodology. It publishes a monthly AI Citation Benchmark using Otterly.ai data. Month 10 (24 August to 23 September 2026) records 1,087 AI citations and a 12.36% citation share for NeuralAdX across a fixed set of UK GEO agency queries. It also publishes GEO pricing, with monthly packages from £450 to £10,000 plus VAT.

Honest notes: the benchmark measures NeuralAdX’s own visibility for queries about GEO agencies, not results for clients. It’s a useful proxy, not a client outcome. It’s also a young, small business, which cuts both ways.

POLARIS

Best for: B2B and ecommerce firms with an established SEO programme.

Where: Chalfont St Peter, Buckinghamshire.

POLARIS has worked with businesses since 2009 and runs a GEO practice split into five named services: technical GEO, AI content optimisation, digital PR for AI search, AI search tracking and analytics, and AEO. Its site says it won Best SEO Campaign at the European Search Awards 2025.

Honest notes: the contact form asks about monthly organic budgets starting at £3,000, which gives you a sense of the client size it’s set up for. It may be over-specified for a very small business.

Screaming Frog

Best for: large or technically complex websites.

Where: Henley-on-Thames, Oxfordshire.

Most SEOs know Screaming Frog for its SEO Spider software, but it’s also an agency. Its AI search optimisation service mentions commercial prompt tracking, analysis of how AI bots crawl and use your content, AI referral metrics, multi-touch attribution, and outreach to pages that AI tools already cite. The bot analysis matters more than it sounds: Vercel found that none of the major AI crawlers it monitored rendered JavaScript, so a technically complex site can look very different to ChatGPT than it does to Google.

Honest notes: ask how advisory work splits against implementation, and how much content and PR support comes with the technical work.

The SEO Works

Best for: businesses extending an existing SEO programme into AI search.

Where: Sheffield city centre. Founded in 2009.

The SEO Works offers a GEO service as part of a broad, established SEO offer. It says it tracks mentions in AI-generated answers, visibility in AI Overviews, backlinks and brand mentions, direct referrals from AI tools and performance on conversational queries. That last one is a sensible inclusion, because AI tools rewrite questions into longer, more conversational sub-queries.

Honest notes: a larger agency brings process. A boutique may move faster on implementation, so ask about turnaround on technical fixes.

Varn

Best for: research-led organisations and teams that want to build skills in-house.

Where: London and Bradford on Avon, Wiltshire.

Varn describes itself as an independent UK agency with a dedicated GEO service and an innovation team that researches and tests GEO tools and methods. It also runs SEO, GEO and data training, with courses from £395 per person, covering topics such as structuring content for AI readability and reporting on AI referral traffic.

Honest notes: ask to see how Varn separates the effect of GEO work from general organic growth. It’s a fair question for any agency here, and a research-led one should have a good answer.

How do you choose between GEO agencies?

Start with what you need done, then judge each agency on evidence rather than adjectives. Five checks separate the strong proposals from the rest.

• A real baseline. Ask how they’ll measure your current visibility across a fixed set of commercially relevant prompts, run more than once. A handful of screenshots isn’t a baseline.
• Who implements. Some agencies advise; others do the technical fixes, content and PR themselves. Find out before you compare prices.
• Off-site capability. AI tools lean heavily on what other sites say about you. In a UK study of almost 200,000 ChatGPT citations, Obsero found specialist publishers and brand sites each made up 25%, against 15% for traditional media. Ask what the agency will do beyond your website.
• Commercial measurement. Mentions are useful, but you want to see how they connect to enquiries and revenue. The PRCA’s guidance on measuring GEO calls user-facing citation counts a vanity metric when used on their own.
• Honesty about uncertainty. Google says that even pages meeting every requirement aren’t guaranteed to be crawled, indexed or served. An agency that guarantees AI citations is promising something nobody controls.

Our full guide to how to choose an AI SEO agency covers what the services should include, typical costs and the questions to ask. For the tactics a good agency should be using, see the GEO tactics most agencies miss.

Questions to put in your agency brief

• Which AI platforms will you monitor, and how often?
• How will you build the prompt set, and will it stay fixed so we can compare months?
• What does your starting audit cover?
• Which deliverables does your team implement, and which do we?
• How do technical SEO, content and digital PR work together in your plan?
• How do you spot and correct inaccurate information about our brand?
• Which reports and data will we own and be able to export?
• How will results connect to leads, sales or revenue?
• What evidence can you show from a comparable business?
• What will you deliver in the first 90 days?

FAQs

What is the best GEO agency in the UK?

There isn’t one best GEO agency for everyone. The right choice depends on your sector, site size, budget and whether you want an agency to implement the work or advise your team. Shortlist two or three from a list like this, ask each for a baseline and a 90-day plan, and compare the evidence.

What’s the difference between a GEO agency and an AI SEO agency?

Very little in practice. GEO focuses on being cited in AI-generated answers, AEO on being the direct answer, and AI SEO is the umbrella term for SEO that accounts for AI search. Most agencies on this list offer all three. Judge them on the work described, not the label. Our AEO explainer covers the distinctions.

How much do GEO agencies charge in the UK?

Most sell GEO as a monthly retainer, often bundled with SEO, and few publish prices. Of the agencies here, NeuralAdX lists monthly GEO packages from £450 to £10,000 plus VAT, and POLARIS’s enquiry form starts at £3,000 a month for organic search. Compare proposals on deliverables, not the headline fee.

Can a GEO agency guarantee my brand will appear in ChatGPT?

No. AI answers vary between runs and platforms decide what they show. A good agency improves the signals that make citations more likely, measures progress against a fixed baseline, and is honest about what it can’t control.

Why is Castle on its own list?

Because we offer a GEO service and it would be odd to leave ourselves out. We’ve applied the same criteria to ourselves, listed in alphabetical order, flagged the disclosure and included our own honest notes. If you’d like to see where you stand before talking to anyone, our complete guide to AI SEO and GEO is a good place to start.