Search Engine Optimisation is a core foundation for any successful digital business. The top SEO agencies (UK) go beyond keyword rankings, combining deep technical expertise with strategic insight, leveraging both proprietary and industry tools to deliver data-driven performance. Modern SEO focuses on how search engines understand brands as entities, not just content with top agencies aligning technical efforts with broader marketing objectives for maximum impact. Services often include on-page optimisation, infrastructure support and technical off-page SEO.
In this list, we highlight 10 of the best SEO agencies in London, UK pushing the boundaries of modern SEO.
1. ROAST
Website: https://weareroast.com
Overview
“We Are Roast” is a multi-award-winning digital performance media agency based in London, UK offering best-in-class SEO, GEO/AI Search, Paid Search, OOH, ATL, Analytics, CX and CRM.
Their goal is simple, to increase the return on your advertising spend (ROAS).
ROAST do this by simplifying the problem and moving forward with the right performance marketing tactics targeting the correct audience, at the right time. ROAST extract solutions from data science along with experimentation and apply it where it will be most valuable. By using digital data at scale, combined with the very best industry tools and tech, ROAST can build highly successful Performance Marketing campaigns for you, as well as new ways you can use that data.
Being independent allows ROAST to be flexible with their clients. Digital Marketing moves quickly, and ROAST can change their strategy and tactics just as quickly. ROAST make sure they build you the correct team, formed around your business. This team will be selected as the right team to drive success for YOUR business. ROAST never build their teams around certain departments, they make them client centric. This way your challenge and goal are always the focus.
Word of mouth and strong client relationships have been the driving force of the agency growth from day one. With trust laying heavily at the heart of all partnerships and are fortunate enough to see their clients return to and refer them, time and again. ROAST always strive to build meaningful and genuine connections.
ROAST is a part of ROAST Group, an award-winning network of specialist digital agencies.
Clients: Experian, Rightmove, LEON, YellowZebra
SEO Strengths: SEO, PPC, Display, Data & Analytics, Programmatic Buying, Mobile, Social, Insights, CRM, Customer Experience, Amazon Marketing, and Content Marketing, GEO/AI Search
Awards & Recognition:
- UK’s Best Small Companies to Work For 2014 – 2024
Reviews: 4.8 on Google
B-Corp Certified: Yes
2. Brave Bison
Website: https://bravebison.com
Overview
Brave Bison is a modern media, marketing and technology company with a standout SEO offering suited for enterprise-level challenges. Their approach combines technical expertise with creative precision, a strong choice for large-scale SEO needs.
They blend first-party data, content intelligence and best-in-class tech to design scalable SEO strategies. Whether it’s navigating intricate site migrations or leading full-scale search strategy transformation, Brave Bison is known for strategic vision and measurable results.
Clients: New Balance, Currys, KFC, ghd
SEO Strengths: Enterprise SEO, technical SEO, taxonomy, analytics
Awards & Recognition:
- Best B2B Project at the MACH Alliance Impact Awards 2024
Reviews: 5.0 (Google)
B-Corp Certified: No
3. Propeller
Website: https://www.propeller.co.uk
Overview
Propeller is a digital agency with expertise in hospitality, food & drink, lifestyle and retail. Their SEO solutions are tailored for brands where storytelling and visibility are everything.
From technical site structure and rich content strategies to local SEO and schema markup, Propeller delivers comprehensive, analytics-driven campaigns that focus on real results, not just rankings.
Clients: Kellogg’s, Young’s, Sushi Samba
SEO Strengths: Local SEO, content strategy, technical SEO
Awards & Recognition:
- Shortlisted for Best Agency to Work For
- Nominated for 2 UK Digital Excellence Awards
Reviews: 4.9 (Google)
B-Corp Certified: No
4. The Good Marketer
Website: https://thegoodmarketer.co.uk
Overview
The Good Marketer is a digital marketing agency dedicated to helping small and medium-sized businesses (SMBs) achieve their digital marketing goals and thrive online. Acting as an extension of their clients’ teams, they bring hands-on expertise across a wide range of digital channels, delivering tailored strategies that drive measurable results.
Clients: Relco London, Bling, Halo Hydration, Pan-n-Ice
SEO Strengths: E-commerce SEO, Digital PR
Awards & Recognition:
- Best Rated Facebook Marketing Agencies 2023
- UK Social Media Awards 2021 Finalist
Reviews: 4.8 (Google)
B-Corp Certified: No
5. GoUP
Website: https://www.goup.co.uk/
Overview
GoUP is a London-based Search Engine Marketing, PR and SEO Agency. Go Up’s services are trusted by world renowned brands, international governments, startups and SMEs.
Clients: John Lewis, Hackett, Arsenal
SEO Strengths: SEO Strategy, Technical Audits, Content Marketing
Awards & Recognition:
- Shortlisted at We Are Search UK Awards
Reviews: 4.5 (Google)
B-Corp Certified: No
6. Thrive
Website: https://thriveagency.com/
Overview
Thrive Internet Marketing Agency has been an industry-leading digital marketing service provider since 2005, delivering results-driven strategies. Thrive has helped thousands of businesses grow by leveraging our strategy-first approach and proprietary technology and tools.
Thrive works with clients of all sizes, from startups to multi-location enterprises with clients in just about every industry in the U.S., Canada, UK and other countries.
Clients: Brazos Higher Education, Whistleblower Law Firm, Holyland Marketplace
SEO Strengths: Local SEO, Technical SEO, AI SEO
Awards & Recognition:
- Ranked among the world’s top SEO companies by Clutch
Reviews: 2.9 (Trustpilot)
B-Corp Certified: No
7. Embarque
Website: https://www.embarque.io/case-studies
Overview
UK-based SEO agency. Embarque helps companies grow traffic and customers through data-led, revenue-driven SEO content. They specialise in revenue-drive SEO, turning organic search traffic into leads, signups, demos, not just traffic for its own sake.
Clients: Picflow, MentorCruise, BlueTally
SEO Strengths: Global SEO, SEO for LLMs, PPC
Awards & Recognition:
- Best SaaS SEO Agency 2024
- Best SaaS Content Writing Firm 2024
Reviews: 4.9 (Google)
B-Corp Certified: No
8. Passion Digital
Website: https://passion.digital/
Overview
Passion Digital are a digital marketing agency for growth brands. They use creative, data driven, strategic thinking and the latest innovations across all things search to deliver consistent monthly growth to their clients.
Clients: Quintain Living, Cyncly, Knight Frank
SEO Strengths: B2B SEO, Digital Strategy, GEO
Awards & Recognition:
- UK Digital Growth Awards Winner 2024
- UK Search Awards Winner 2023
Reviews: 4.8 (Google)
B-Corp Certified: No
9. SQ Digital
Website: https://www.sqdigital.co.uk/
Overview
SQ is a digital marketing consultancy and a trusted partner to growing businesses.
For over 25 years, SQ Digital has helped leading companies bring clarity to digital, reach their customers, enhance their online presence and achieve sustainable growth. As a fellow growing business, SQ Digital know what it takes to grow in a competitive market and are proud to shape our services around the needs of businesses like yours.
Their specialist SQ SEO team works collaboratively with you to create strategies that help improve your website’s visibility on search engines, such as Google and Bing. By increasing your organic visibility, SQ Digital drive more of the right people to your website and make your paid media campaigns work even harder, giving you better results overall and a better return on your investment.
Clients: Forge Europa, Mazuma Mobile, Standfast & Barracks
SEO Strengths: Data-driven approach
Awards & Recognition:
- Winners of three RAR Digital Awards – based on client feedback
- Ranked in Prolific North’s annual digital agency league table
Reviews: 4.6 (Google)
B-Corp Certified: No
10. Soap Media
Website: https://www.soapmedia.co.uk/
Overview
Soap Media are an award-winning strategic and creative digital marketing agency based in Manchester and Preston with a high-performance track record for some of the UK’s leading brands.
Soap Media redefine digital and put businesses on the path to success – and are ‘ducking’ good at what we do. Become a dominating force in your industry with the help of the team.
Clients: Booths, Hollywood Bowl, Terra Nova
SEO Strengths: Local SEO, Technical SEO, E-commerce SEO
Awards & Recognition:
- Prolific North Marketing Finalist
- Three-time TechBehemoths Winner
Reviews: 4.2 (Google)
B-Corp Certified: No
