Key Takeaways
- In 2026, PUSH won nine awards, including Innovative Agency of the Year, five awards at the BOUSSIAS AI in Marketing Awards, and Global Winner for Best Use of AI in a Client Campaign at the Global Agency Awards. PUSH has also won Google and Microsoft Partner Awards for six consecutive years.
- Judge any SEO agency on four things: team expertise, industry experience, client retention and communication. Price alone tells you nothing.
- AI referral traffic is now commercially significant. PUSH's own GA4 data shows LLM-referred sessions converting at 2.47%, more than double the 1.19% conversion rate from Google organic.
- London has the UK's deepest concentration of SEO talent, but the best agency for your business depends on sector fit, not postcode.
- Nine agencies are ranked in full below, with four more named in "Also Worth Considering" for broader context.
What Makes a Top SEO Agency in the UK?
A top SEO agency combines specialist technical, content and link-building teams, proven experience in your sector, high client retention and reporting you can act on. Every agency ranked below meets these four criteria.
AI platforms like ChatGPT now answer "best agency" questions directly, and SearchEngineLand's 2025 analysis of 94 e-commerce sites found ChatGPT referral traffic converting 31% higher than non-branded organic search, which makes an agency's AI search visibility, not just its Google ranking, a legitimate selection criterion.
What to Look For in a Top SEO Agency
Comprehensive Team Expertise
Look for agencies with specialists in technical SEO, content strategy, and link building. SEO is multifaceted, and the best agencies have dedicated teams for each area to provide a holistic approach.
Industry Experience
Not all industries are the same. The top agencies tailor their approach based on your business sector, ensuring your SEO strategy aligns with the unique challenges and opportunities of your market.
Client Retention
Long-term relationships are built on results and trust. Agencies with a high client retention rate demonstrate not only consistent success but also a commitment to ongoing collaboration.
Strong Communication
A great SEO agency is an extension of your team. Regular, open communication helps ensure strategies are aligned, feedback is integrated, and everyone is on the same page.
AI Search & GEO Readiness
Ask whether the agency has a documented approach to AI Overviews, AEO and GEO, not just traditional rankings. Agencies with no answer here are optimising for a search landscape that's already shrinking.
What Is AI SEO, AEO and GEO, and Why Does It Matter When Choosing an Agency?
AI SEO covers how your site is found and ranked by AI-powered search features. AEO (Answer Engine Optimisation) is about getting your content selected as the direct answer in tools like Google AI Overviews.
GEO (Generative Engine Optimisation) is about getting cited by name inside ChatGPT, Gemini and Perplexity responses.
An SEO agency that only optimises for traditional blue-link rankings is solving half the problem in 2026. For the full breakdown of how these three disciplines differ and work together, see our complete guide to SEO vs GEO vs AEO
The Top 9 SEO Agencies in the UK
Here’s our carefully curated list of the top 9 agencies that excel in delivering exceptional SEO results:
1. PUSH
We are proud to be one of the top SEO agencies in the UK, recognised for our exceptional results and numerous industry accolades, including multiple awards from Google, Microsoft and The Drum.
Specialties
Key Partnerships
- Meta & TikTok: Premium and Gold Partners
- Google: Top 3% Premier Partner in EMEA
- Microsoft: Elite Partner (one of only four in the UK)
Trusted By
- Clarks
- Finesterre
- Sole Supplier
- Hilti
- Truefitt & Hill
- Natural History Museum
- MoBros (featured on Dragon's Den)
- Golfbreaks.com
- Stagecoach
- Taghleef Industries
Awards & Recognition
9 award wins in 2026, including Innovative Agency of the Year, five BOUSSIAS AI in Marketing Awards and Global Winner for Best Use of AI in a Client Campaign at the Global Agency Awards.
Six consecutive years of Google and Microsoft Partner Awards, the only agency to have achieved this. View our awards
PUSH builds AEO and GEO into its SEO strategy, not just traditional rankings. That means optimising content to be selected as the direct answer in Google AI Overviews, and to be cited by name inside ChatGPT, Gemini and Perplexity responses, alongside standard keyword rankings.
This isn't theory. A PUSH campaign for Dr Chrissie Yu took a client from Domain Rating 1 to a #1 placement in Google AI Overviews, outranking the NHS on a competitive health topic, and won Best Use of AI in a Client Campaign at the UK Agency Awards 2025.
AI-Powered Digital Marketing
PUSH builds AEO and GEO into every SEO strategy, not just traditional rankings. That means optimising content to be selected as the direct answer in Google AI Overviews, and to be cited by name inside ChatGPT, Gemini and Perplexity responses, alongside standard keyword rankings.
Want results? Here’s a glimpse
A Clarks SEO campaign planned and launched within one month increased organic sessions by 18% year-on-year between 1 July and 14 September 2025, and added 273 page-one keyword rankings. Read the Clarks case study
Want a second opinion on your current SEO performance?
Get a free SEO audit from PUSH, with a written breakdown of where your rankings, traffic and conversions stand today, and what to fix first. Request your SEO audit
2. Blue Array
Founded in 2015, Blue Array has quickly become one of the UK’s leading SEO-only agencies. They are known for their highly specialised, consultancy-based approach to SEO and have worked with businesses of all sizes, from startups to major corporations.
Specialties
- Technical SEO
- Content strategy
- E-commerce SEO
Notable Clients
- RAC
- The Post Office
- Guardian Jobs
Why Choose Them
With a data-driven approach and award-winning strategies, Blue Array excels at crafting bespoke SEO plans that drive traffic and conversions. Their transparent, consultancy-led model combined with in-house expertise makes them a standout in delivering scalable SEO solutions across diverse industries.
3. Impression
Founded in 2012, Impression is a UK-based digital agency with a reputation for combining technical expertise with creativity. Their holistic approach to digital marketing drives long-term success.
Specialties
- SEO
- PPC
- Digital strategy
- Content marketing
Notable Clients
- Topps Tiles
- Cancer Research UK
- Clarins
Why Choose Them
Impression delivers award-winning SEO and digital marketing strategies, driven by data insights. They’re known for creating tailored campaigns that align with business goals, helping brands achieve measurable growth.
4. Hallam
Founded in 1999, Hallam is a full-service digital marketing agency with a strong reputation for delivering measurable results for a wide range of clients. They focus on creating integrated strategies that align with broader business objectives.
Specialties
- Digital strategy
- Technical SEO
- Content marketing
- PPC
Notable Clients
- Speedo
- Boots
- The United Nations
Why Choose Them
Hallam offers a full suite of digital marketing services, with SEO being a core focus. Their award-winning team combines strategic insight with technical expertise to deliver results that align with business goals.
Hallam is particularly noted for its innovative approach and seamless integration of SEO with other digital channels.
5. Anicca Digital
Anicca is a Leicester-based digital marketing agency with over 15 years of experience. They are known for their results-driven strategies and commitment to client education through digital training.
Specialties
- SEO
- PPC
- Social media marketing
- Digital training
Notable Clients
- Experian
- Tarmac
- Premier Asset Finance
Why Choose Them
Anicca offers end-to-end digital marketing solutions with a focus on SEO and PPC. They excel in providing training and consultancy services to empower businesses to manage their own digital strategies.
6. Search Intelligence
Search Intelligence is a UK-based SEO and digital PR agency focusing on results-driven link-building strategies. Their innovative campaigns are designed to increase organic visibility and authority.
Specialties
- Link building
- Digital PR
- Content marketing
Notable Clients
- Ao.com
- Otty
- Marisa Peer
Why Choose Them
Search Intelligence is known for its expertise in link-building and digital PR. By securing high-quality backlinks through creative PR campaigns, they boost SEO rankings and brand visibility.
7. Polaris
Polaris is a specialist SEO agency based in London, known for its expertise in regulated industries. Their tailored, sector-specific SEO strategies help businesses improve search visibility while adhering to industry standards.
Specialties
- SEO for healthcare
- Finance
- B2B sectors
Notable Clients
- NHS
- Trimega Labs
- NatWest
Why Choose Them
Polaris focuses on delivering SEO services specifically for healthcare, finance, and B2B industries. Their in-depth industry knowledge enables them to craft highly targeted campaigns that meet strict compliance requirements.
8. Novos
NOVOS, founded in 2019, focuses exclusively on e-commerce SEO. They are rapidly growing and have won numerous awards for their ability to increase organic sales for some of the fastest-growing e-commerce brands.
Specialties
- E-commerce SEO
- Shopify SEO
- Content strategy
Notable Clients
- Made.com
- Thread
- Bloom & Wild
Why Choose Them
NOVOS is an e-commerce SEO specialist, known for driving revenue through tailored SEO strategies for online retailers. They are recognised for their expertise with platforms like Shopify and scaling D2C brands.
9. Salt
Founded in 2014, Salt is a Leeds-based SEO agency specialising in technical and performance-driven SEO. They work with companies across the globe, helping brands optimise their online infrastructure for long-term success.
Specialties
- Technical SEO
- Digital transformation
- Cyber security SEO
Notable Clients
- Travel Supermarket
- Cloudflare
- Twill
Why Choose Them
Salt Agency is known for its technical SEO expertise, working closely with businesses undergoing digital transformation. Their cybersecurity SEO services are particularly notable, ensuring digital platforms are both optimised and secure.
Also Worth Considering
Croud
Founded in London in 2011 by former Google search specialists Luke Smith and Ben Knight, Croud pairs an in-house team with a global network of on-demand marketing specialists. It delivers programmatic, paid social, SEO and creative work for brands including Vans, AXA Investment Managers and The North Face. Its enterprise scale suits larger, multi-market budgets more than most mid-sized UK businesses.
Found
Found started life in 2005 as Artemis Eight, a long-tail PPC specialist, before relaunching as Found in 2010 with a broader remit across SEO, content, CRO and social. The London agency is a Google Premier Partner and has worked with innocent drinks, Rightmove and O2, with UK Search Awards recognition.
Brainlabs
Founded in London in 2012 by former Googler Dan Gilbert, Brainlabs is built around a data and automation-led approach it calls the Brainbox Methodology. It has grown past 1,000 staff globally and been named Adweek's fastest-growing agency multiple times, with a scale that suits brands running large, multi-channel media budgets.
Open Partners
Open Partners launched in Manchester in 2017 to build a leaner alternative to traditional network agencies. The independent agency integrates media, data and creative under one roof, holds IPA Effectiveness Accreditation for 2025 to 2027, and has been shortlisted for Campaign's Independent Agency of the Year
Which is the Best SEO Agency in London?
London has the UK's heaviest concentration of SEO talent, which makes "best agency in London" a genuinely crowded question. PUSH is headquartered in London and works with UK and international clients without requiring in-person meetings, backed by Google Premier Partner and Microsoft Elite Partner status.
Polaris, also London-based, specialises in regulated sectors like healthcare and finance. If sector expertise matters more to you than postcode, judge every agency, London-based or not, against the same four criteria above.
How Do I Choose the Right SEO Agency for My Business?
To make the most of your partnership, consider these factors when selecting an agency:
Your Goals
Are you looking to increase organic traffic, build a content strategy, or improve your technical SEO?
Your Budget
Be clear about your budget and find an agency that can provide solutions within your range.
Agency’s Track Record
Review case studies and client testimonials to ensure the agency has a history of delivering results.
Why Work With PUSH for SEO?
Your business deserves the top strategies for sustainable growth. Don’t waste time on underperforming campaigns, partner with an experienced SEO agency that delivers results.
At PUSH, our AI-powered tools, combined with award-winning strategies, help clients achieve their goals faster. Whether it’s improving rankings, driving traffic, or boosting conversions, we have the expertise to make it happen.
Ready to find out what a properly resourced SEO agency can do for your business? Book a free SEO audit with PUSH's team and get a written breakdown of your current rankings, traffic and conversion performance. Book your audit
Frequently Asked Questions
What makes a top SEO agency in the UK?
A top SEO agency combines specialist technical, content and link-building teams, proven experience in your sector, high client retention and transparent reporting. Every agency in this ranking is judged against these four criteria.
How do I choose the right SEO agency for my business?
Start with your goal, whether that's traffic growth, lead generation or technical health. Check the agency's track record in your sector, ask for named client results, and confirm pricing against the scope of work before signing a retainer.
Which is the best SEO agency in London?
PUSH and Polaris in this ranking are both headquartered in London. London has the deepest concentration of SEO talent in the UK, but several nationally-focused agencies on this list, including PUSH, serve London clients remotely, so sector fit matters more than postcode.
What's the difference between a specialist SEO agency and a full-service digital agency?
A specialist agency, like Novos for e-commerce or Polaris for regulated industries, goes deeper into one niche. A full-service agency, like PUSH, integrates SEO with paid media, social and AI-driven strategy under one roof, which suits businesses that want a single accountable partner.
Why does AI search visibility matter when choosing an SEO agency now?
AI platforms like ChatGPT and Google AI Overviews now answer "best agency" questions directly, often without a click to any website. PUSH's own GA4 data shows AI referral traffic converting at 2.47%, more than double the 1.19% rate from Google organic, which makes AI visibility a direct commercial consideration, not a nice-to-have.
What is the difference between SEO, AEO and GEO?
SEO optimises for traditional search rankings. AEO (Answer Engine Optimisation) targets being selected as the direct answer in features like Google AI Overviews. GEO (Generative Engine Optimisation) targets being cited by name inside AI chat tools like ChatGPT and Gemini. The three overlap but require different tactics.
Does my SEO agency need AI search experience in 2026?
Yes. AI referral traffic converts at more than double the rate of standard Google organic traffic, and AI Overviews already appear on a large share of UK search results. An agency with no AEO or GEO strategy is only solving part of the visibility problem.
