Best SEO Companies in the United Kingdom (2026)
Updated
This ranking covers nine SEO companies with verifiable UK offices, from Sheffield, Nottingham and Cheltenham to London and Manchester. Each is scored on the same six weighted criteria using facts we read on the agency's own website, and every claim links to its source. Scores reflect public information only, so treat them as a starting shortlist, not a substitute for a proposal and references.
SEO Companies in the United Kingdom compared
| Rank | Agency | HQ city | Score | Best for |
|---|---|---|---|---|
| 1 | The SEO Works | Sheffield | 4.3 | UK brands that want SEO and GEO from one specialist team with published case studies. |
| 2 | Reboot Online | London | 4.2 | Brands that want SEO, digital PR and GEO tested and measured, with published starting pricing. |
| 3 | Impression | Nottingham | 4.2 | Brands that want technically strong SEO and GEO inside a wider performance marketing programme. |
| 4 | Click Intelligence | Cheltenham | 4.1 | Brands that want link building and SEO with a named GEO service from a large specialist team. |
| 5 | Found | London | 4.1 | Ecommerce and international brands that want SEO, GEO and paid search from one London team. |
| 6 | Re:signal | London | 4.1 | Ecommerce brands that want SEO and GEO from a specialist retail team. |
| 7 | Breakline | Guildford | 3.9 | Local and service businesses that want SEO and GEO on flexible, no-contract terms. |
| 8 | Kaizen | London | 3.7 | Brands that want digital PR-led SEO with a GEO and AI search service. |
| 9 | Varn | London | 3.6 | Brands that want technical SEO tied to data and analytics work, with GEO and training support. |
1. The SEO Works
The SEO Works says it has focused on search since 2009 and works from Sheffield, London and Leeds. Its site publishes case studies with stated outcomes, including a 300% rise in organic users for an online golf store and a GEO case study reporting a 78% uplift in sales from AI referrals for a coffee brand, and it has dedicated GEO, AEO and AI SEO service pages.
Best for: UK brands that want SEO and GEO from one specialist team with published case studies.
Services: SEO, GEO, AEO, AI SEO, Digital PR, PPC
- Says it has focused on search since 2009 and works from Sheffield, London and Leeds
- Dedicated GEO, AEO and AI SEO service pages
- Case studies with stated results, for example 300% more organic users for an online golf store (as stated by the agency)
- Describes itself as an official Google Partner and Bing Accredited
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 4.5 / 5
- Client reviews: 3.5 / 5
- Local market fit: 5 / 5
- AI search readiness: 5 / 5
- Transparency: 3.5 / 5
Sources (September 26, 2026): seoworks.co.uk/about-seoworks/, seoworks.co.uk/seo-services/generative-engine-optimisation-geo/, seoworks.co.uk/seo-services/answer-engine-optimisation-aeo/
2. Reboot Online
Reboot Online is a London search marketing agency founded by Shai and Naomi Aharony in 2012. It publishes SEO, GEO and digital PR case studies with numbers, such as a +194.72% rise in LLM referral traffic for a property insurer, runs a dedicated GEO service, and states that GEO pricing starts at 2,500 pounds per month.
Best for: Brands that want SEO, digital PR and GEO tested and measured, with published starting pricing.
Services: SEO, GEO, Digital PR, AiPR, Earned media, Training and consultancy
- Registered address at High Road, London N12; founded 2012 by Shai and Naomi Aharony
- Dedicated GEO service page with prompt testing and visibility mapping
- Publishes GEO pricing from 2,500 pounds per month
- Case studies include +194.72% LLM referral traffic and 552.52% organic traffic growth (as stated by the agency)
Pricing: GEO pricing starts at 2,500 pounds per month, per its GEO service page.
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 4.5 / 5
- Client reviews: 3.5 / 5
- Local market fit: 4.5 / 5
- AI search readiness: 5 / 5
- Transparency: 4 / 5
Sources (September 26, 2026): rebootonline.com/about-us/, rebootonline.com/geo/, rebootonline.com/case-studies/, rebootonline.com/contact/
3. Impression
Impression is a Nottingham performance marketing agency with offices in London and Manchester and a team it puts at 120+. Its site has a dedicated GEO agency page with a case study for Tensar reporting 7.9 million organic impressions across AI Overview keywords, and it describes technical SEO as its founding strength.
Best for: Brands that want technically strong SEO and GEO inside a wider performance marketing programme.
Services: SEO, Technical SEO, International SEO, GEO, Paid media, Digital PR
- Offices in Nottingham, London and Manchester
- Dedicated generative engine optimisation agency page
- GEO case study for Tensar reporting 7.9M organic impressions across AI Overview keywords (as stated by the agency)
- Says it is a 120+ strong team and a Google Partner agency
Score breakdown
- Technical SEO depth: 4.5 / 5
- Verifiable results: 4 / 5
- Client reviews: 3.5 / 5
- Local market fit: 4.5 / 5
- AI search readiness: 5 / 5
- Transparency: 3.5 / 5
Sources (September 26, 2026): impressiondigital.com/about/, impressiondigital.com/generative-engine-optimisation-agency/
4. Click Intelligence
Click Intelligence is a Cheltenham agency, founded in 2013, with a second office in London. It lists SEO, AI SEO and GEO as separate services, publishes a set of SEO and link-building case studies, and states a 97% client retention rate and a team of more than 150.
Best for: Brands that want link building and SEO with a named GEO service from a large specialist team.
Services: SEO, Link building, GEO / AI SEO, Digital PR, Managed SEO, Enterprise SEO
- Office at Royal Crescent, Cheltenham, plus a London office
- Dedicated generative engine optimisation service page describing six GEO workstreams
- Says its team has grown from 2 people in 2013 to more than 150 (self-reported)
- States a 97% client retention rate (self-reported)
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 4 / 5
- Client reviews: 3.5 / 5
- Local market fit: 4.5 / 5
- AI search readiness: 5 / 5
- Transparency: 3.5 / 5
Sources (September 26, 2026): clickintelligence.co.uk/about-us/, clickintelligence.co.uk/services/generative-engine-optimisation/, clickintelligence.co.uk/seo/ai-seo/
5. Found
Found is a London agency at Hatton Garden with a New York office. It lists SEO, AI SEO and GEO as separate services with a dedicated GEO page, publishes technical, ecommerce and international SEO pages, and lists 2026 UK Digital Excellence Awards on its about page.
Best for: Ecommerce and international brands that want SEO, GEO and paid search from one London team.
Services: SEO, AI SEO, GEO, Technical SEO, Ecommerce SEO, International SEO, Paid media
- Office at Hatton Garden, London EC1N
- Dedicated GEO SEO service page and an Everysearch AI hub
- Separate service pages for technical, ecommerce and international SEO
- Lists UK Digital Excellence Awards 2026 wins (self-reported)
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 3.5 / 5
- Client reviews: 3.5 / 5
- Local market fit: 5 / 5
- AI search readiness: 5 / 5
- Transparency: 3.5 / 5
Sources (September 26, 2026): found.co.uk/about-us/, found.co.uk/services/seo/ai-seo/geo-seo/
6. Re:signal
Re:signal is a London ecommerce SEO agency with a Manchester office. Its homepage reports outcomes for named retail clients, including a 20X organic revenue rise for ASICS and 2.76 million pounds in sales for Vivobarefoot, and it runs a GEO service aimed at ecommerce brands.
Best for: Ecommerce brands that want SEO and GEO from a specialist retail team.
Services: Ecommerce SEO, GEO, Technical SEO, Digital PR, Content
- Offices in London (Eastbourne Terrace) and Manchester
- Dedicated GEO agency page for ecommerce brands
- Client outcomes on its homepage include ASICS organic revenue 20X and FatFace +96% (as stated by the agency)
- States it has won 89 Search Awards (self-reported)
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 4.5 / 5
- Client reviews: 3.5 / 5
- Local market fit: 4 / 5
- AI search readiness: 5 / 5
- Transparency: 3 / 5
Sources (September 26, 2026): resignal.com, resignal.com/approach/ai-search/, resignal.com/contact/
7. Breakline
Breakline is a Guildford SEO agency with a London office that focuses on service businesses. It states it has been around for 10+ years, publishes case studies with traffic figures, sells SEO and GEO plans on monthly rolling terms with no contract, and says Clutch has named it best SEO agency for eight consecutive years.
Best for: Local and service businesses that want SEO and GEO on flexible, no-contract terms.
Services: SEO, GEO, Local SEO, Technical SEO, Reputation management
- Offices in Guildford (Station View) and London (Old Bailey)
- Monthly rolling terms with no contract, per its homepage
- Case studies report traffic growth, for example 171% for an automotive platform (as stated by the agency)
- Says Clutch named it best SEO agency for eight consecutive years (self-reported)
Score breakdown
- Technical SEO depth: 3.5 / 5
- Verifiable results: 4 / 5
- Client reviews: 3.5 / 5
- Local market fit: 4 / 5
- AI search readiness: 4.5 / 5
- Transparency: 4 / 5
Sources (September 26, 2026): breaklineagency.com, breaklineagency.com/about-us/, breaklineagency.com/contact/
8. Kaizen
Kaizen is a London SEO and digital PR agency with a Manchester hub, founded by Pete Campbell in 2013. It runs a GEO and AI search service alongside SEO, digital PR and social, and its case studies include Reebok keyword rankings in multiple markets.
Best for: Brands that want digital PR-led SEO with a GEO and AI search service.
Services: SEO, Digital PR, GEO / AI search, Social
- HQ at Zetland House, London EC2A, with a creative hub in Manchester
- Founded by Pete Campbell in 2013
- Dedicated GEO and AI search agency page
- Case study on improving generic keyword rankings for Reebok in multiple markets
Score breakdown
- Technical SEO depth: 3.5 / 5
- Verifiable results: 3.5 / 5
- Client reviews: 3 / 5
- Local market fit: 5 / 5
- AI search readiness: 4.5 / 5
- Transparency: 3 / 5
Sources (September 26, 2026): kaizen.co.uk/about-us, kaizen.co.uk/our-services/geo-ai-agency, kaizen.co.uk/contact
9. Varn
Varn is a specialist SEO, GEO and data analytics agency with offices in London and Bradford on Avon, near Bath. It says it has been building online visibility for more than 15 years, and its site lists dedicated technical SEO, AI search and innovation, and training services. We found few named case-study figures on the pages we read.
Best for: Brands that want technical SEO tied to data and analytics work, with GEO and training support.
Services: Technical SEO, GEO, Data and analytics, Digital PR, Content marketing, SEO and GEO training
- Offices in London (Gray's Inn Road) and Bradford on Avon, near Bath
- Dedicated AI search and innovation service page
- Says it has been doing this for over 15 years (self-reported)
- Sector pages for B2B, ecommerce, financial services and technology
Score breakdown
- Technical SEO depth: 4 / 5
- Verifiable results: 3 / 5
- Client reviews: 3 / 5
- Local market fit: 4.5 / 5
- AI search readiness: 4 / 5
- Transparency: 3 / 5
Sources (September 26, 2026): varn.co.uk, varn.co.uk/about-us/, varn.co.uk/services/ai-search-innovation/
Frequently asked questions
- How do you rank SEO companies in the United Kingdom?
- Each agency is scored 1-5 on six weighted criteria: technical SEO depth, verifiable results, client reviews, local market fit, AI search readiness and transparency. All nine agencies are ordered strictly by their score.
- How much does SEO cost in the UK?
- It depends on scope and competition, and most agencies quote by proposal. Reboot Online publishes GEO pricing from 2,500 pounds per month on its GEO page. We did not find published prices for the other agencies listed here.
- How long does SEO take to show results?
- Most SEO programmes need several months before organic traffic and leads move measurably, depending on site health, competition and content volume. Treat any guaranteed ranking or guaranteed timeline with suspicion.
- Should I hire an agency in London or elsewhere in the UK?
- Location matters less than fit: agencies here work with clients across the UK and abroad from Sheffield, Nottingham, Cheltenham, Manchester and London. Look for a team that has worked in your sector and can show named results.
- Which of these agencies also do GEO or AI search optimisation?
- All nine name GEO, AI SEO or AI search on their own sites. Reboot Online, The SEO Works, Click Intelligence, Found, Impression, Re:signal and Kaizen have dedicated pages. See our ranking of the best GEO companies in the United Kingdom for how those services compare.
- What should I ask an SEO company before signing?
- Ask for named case studies with measurable outcomes, who does the work, how reporting works, what link-building methods are used, whether contracts are binding, and how the agency handles AI search such as Google AI Overviews and ChatGPT.
How we ranked these agencies
We found candidates through web search and agency directories (Clutch, Semrush Agencies, GoodFirms, Sortlist, DesignRush and UK agency round-ups), then opened each agency's own site to confirm it exists, lists a real office in the United Kingdom, and offers the services described. Each agency is scored 1-5 in half-point steps per criterion; the page score is the weighted average. Ties are broken by evidence of results. Clutch and GoodFirms block automated access, so we could not verify third-party review counts and show none: the "Client reviews" criterion reflects named testimonials, awards and review-platform recognition shown on the agency's own site, and 3.0 is the baseline for a site with testimonials or client claims we could see. Self-reported awards, client counts and case-study numbers are attributed to the agency, not confirmed by us. Anything we could not verify was left out.
| Criterion | Weight | What earns a 5 vs a 1 |
|---|---|---|
| Technical SEO depth | 20% | 5 = publicly documented technical audits, site-architecture and migration work; 1 = no visible technical SEO offering. |
| Verifiable results | 20% | 5 = named case studies with measurable outcomes and live sources; 1 = only unsubstantiated claims. |
| Client reviews | 20% | 5 = strong, sizeable third-party review profiles (Clutch, Google, GoodFirms); 1 = none found. |
| Local market fit | 15% | 5 = real local office, local-language and local-market experience; 1 = no verifiable local presence. |
| AI search readiness | 15% | 5 = a named AI-search / GEO service with evidence; 1 = no mention of AI search. |
| Transparency | 10% | 5 = published process, pricing or engagement model and named team; 1 = opaque. |