Top 10 SEO Companies In UK

SEO has become a much broader job than getting a page to rank for a keyword.

Technical problems can stop thousands of pages from being indexed. Ecommerce websites have to manage filters, product pages and changing stock. Companies moving to a new website need to protect the search traffic they already have. Content still matters, but publishing more articles is not enough when every competitor is doing the same thing.

Search behaviour is changing as well. Google remains important, but people now also look for products and information on Amazon, TikTok, YouTube and AI tools. UK SEO agencies have started adjusting their work around that change.

Some agencies still concentrate almost entirely on organic search. Others combine SEO with Digital PR, paid media, content or analytics.

This article covers 10 established SEO companies in UK and the type of search work each one handles. The order is not a strict revenue ranking because most agencies do not publish comparable financial figures.

Quick Look at the Top SEO Companies in UK

Rank	Company	UK Base	Main Work
1	Blue Array	Reading	SEO, GEO and Digital PR
2	Impression	Nottingham, London, Manchester	SEO, content and Digital PR
3	Re	London, Manchester	Ecommerce SEO
4	Builtvisible	London	SEO, content and Digital PR
5	SALT.agency	Leeds, London	Technical and enterprise SEO
6	Found	London	SEO and wider search marketing
7	Screaming Frog	Henley-on-Thames	Technical SEO and PPC
8	Click Consult	UK	SEO, content and Digital PR
9	Propellernet	Brighton	SEO and Digital PR
10	Hallam	Nottingham, London	B2B SEO and AI search

1. Blue Array

Founded	2015
Founder	Simon Schnieders
Main Focus	Organic search
Main Services	SEO, GEO, Digital PR

Blue Array was founded in 2015 by Simon Schnieders, who had previously worked in SEO for companies including Zoopla, Daily Mail and Yell.

The company has remained focused on organic search instead of becoming a general digital agency.

Its work covers technical SEO, content, Digital PR and search strategy. Blue Array has also added Generative Engine Optimisation as companies have started paying more attention to how they appear in AI-generated results.

Clients have included RAC, Daily Mail and Simply Business.

Training is another part of the business. Blue Array runs its own academy and has also been involved in London SEO events.

The narrow focus makes the agency different from firms where SEO is one department among ten or fifteen marketing services.

Unique Offerings

• Technical SEO
• SEO strategy
• Content
• Digital PR
• GEO
• SEO training

Official website: Blue Array

2. Impression

Started In	Nottingham
UK Offices	Nottingham, London, Manchester
Team	120+
Main Business	Performance marketing

Impression started in Nottingham and later opened offices in London and Manchester.

The agency now has more than 120 people working across SEO, paid media, Digital PR, analytics and other performance channels.

Technical SEO is an important part of its search work.

That includes crawling and indexing problems, JavaScript, site architecture, Core Web Vitals and website migrations. Impression also has teams working on content, ecommerce SEO and international search.

Its client work has included companies such as The Access Group, Clarins, Topps Tiles, Rise Art and Queensmith.

Digital PR often sits beside SEO on these accounts. Instead of treating links as a completely separate job, the agency uses PR campaigns to earn coverage and links from relevant publications.

Impression has also started working on visibility in AI search tools alongside conventional Google SEO.

Unique Offerings

• Technical SEO
• Ecommerce SEO
• International SEO
• Content
• Digital PR
• AI search
• Website migrations

Official website: Impression

3. Re

Founder	Kevin Gibbons
UK Offices	London, Manchester
Main Focus	Ecommerce
Main Service	Organic growth

Re is mainly known for ecommerce SEO.

The agency works with retailers and other businesses where organic search is expected to contribute directly to sales rather than only bring more visitors to the website.

Its teams work on technical SEO, content and Digital PR.

An ecommerce website creates its own set of problems. One store can have thousands of products, categories and filter combinations. Products disappear when stock changes, while seasonal pages may only matter for part of the year.

Re looks at those issues alongside search demand and organic revenue.

The company also uses forecasting to estimate what an SEO programme may be able to deliver before the work starts.

Its typical engagements are aimed at larger ecommerce businesses rather than very small websites.

Unique Offerings

• Ecommerce SEO
• Technical SEO
• SEO forecasting
• Content
• Digital PR
• AI search

Official website: Re

4. Builtvisible

Founded	2009
Original Name	SEOgadget
UK Base	London
Owner	Brave Bison

Builtvisible began in 2009 as SEOgadget.

Founder Richard Baxter first ran it as an SEO blog before the business developed into an agency. The Builtvisible name came later.

The company works across technical SEO, content and Digital PR.

Its client history includes Asda, Aviva, Specsavers, Superdrug, Icelandair and The Very Group.

Much of the work is aimed at established websites rather than companies starting SEO for the first time.

A project may involve finding technical problems across a large site, understanding why an important section has lost traffic or working out which content could bring more useful organic visitors.

Builtvisible was acquired by Brave Bison in 2025.

It continues to operate under the Builtvisible name, while the acquisition gives clients access to other marketing services inside the wider group.

Unique Offerings

• Technical SEO
• Organic search strategy
• Content
• Digital PR
• SEO consulting
• Search analysis

Official website: Builtvisible

5. SALT.agency

Founded	2014
UK Offices	Leeds, London
Main Focus	Technical SEO
Other Services	Enterprise and international SEO

SALT.agency started in 2014 and has offices in Leeds and London.

Technical SEO is the main area associated with the agency.

Its consultants work on crawling, indexing, site structure, migrations, international websites and other technical issues that become more difficult as a website grows.

The agency has worked with organisations including the University of Leeds, Cloudflare, GitLab and Jewson.

These are not all the same type of website.

A university site can contain thousands of pages managed by different departments. A software company may publish large amounts of documentation. An ecommerce site has products, categories and filters to manage.

The technical problem can therefore be very different from one client to another.

SALT also works on content, international SEO and visibility in AI-driven search.

Unique Offerings

• Technical SEO
• Enterprise SEO
• International SEO
• Migrations
• Technical audits
• AI search
• Content

Official website: SALT.agency

6. Found

Started	2005
Known as Found Since	2010
UK Office	London
Team	90+

Found started in 2005 under the name Artemis Eight.

The original business worked mainly in paid search. It became Found in 2010 and later added SEO, content, Digital PR, social and analytics.

The London agency now has more than 90 specialists.

Its SEO work covers technical optimisation, ecommerce, content and Digital PR.

Found also looks at search outside Google.

The agency uses the term Everysearch for an approach that includes places such as Amazon, social platforms and AI tools alongside traditional search engines.

That reflects a fairly obvious change in user behaviour.

Someone looking for a product may start with Google, but another person may search TikTok, Amazon or ask an AI tool for suggestions.

Found’s current client material includes Toolstation, ManyPets, Bonmarché and Clermont Hotel Group.

Unique Offerings

• Technical SEO
• Content
• Ecommerce SEO
• Digital PR
• AI search
• Search strategy
• Analytics

Official website: Found

7. Screaming Frog

Founded	2010
UK Base	Henley-on-Thames
Agency Services	SEO, PPC
Known For	SEO Spider

Screaming Frog is both an SEO agency and a software company.

It was founded in 2010 and is based in Henley-on-Thames, Oxfordshire.

The company is best known for Screaming Frog SEO Spider.

SEO teams use the software to crawl websites and find problems such as broken links, redirects, duplicate pages and missing metadata.

The agency side works on SEO and PPC.

Technical audits are naturally an important part of that work, but the company also handles ongoing organic campaigns, strategy, content and links.

The software can show where problems exist.

Consultants still have to decide which problems matter, why they happened and what should be fixed first.

That combination of an SEO tool and an agency makes Screaming Frog unusual compared with most companies in this list.

Unique Offerings

• Technical SEO
• SEO consulting
• Website crawling
• SEO audits
• Organic campaigns
• PPC

Official website: Screaming Frog

8. Click Consult

Founded	2003
SEO Experience	20+ years
Current Group	IQVIA
Main Work	Search and digital marketing

Click Consult has worked in search since 2003.

Its services now cover SEO, paid search, Digital PR, content, analytics, social media and web projects.

The company works with businesses in several industries.

Client examples include Age UK, Sanofi, CV-Library and Netflights.

Its SEO work brings technical fixes, content and external authority together.

One website may need all three.

There is little value in producing large amounts of content if important pages are not being indexed properly. At the same time, fixing the technical side will not create demand for a website that has nothing useful to say.

Click Consult joined Ceuta Group in 2018 and later became part of IQVIA.

The agency continues trading under the Click Consult name.

Unique Offerings

• SEO
• Technical optimisation
• Content marketing
• Digital PR
• PPC
• Analytics
• Search strategy

Official website: Click Consult

9. Propellernet

Founded	2003
UK Base	Brighton
SEO Added	2009
Main Work	SEO, Digital PR, paid media

Propellernet started in Brighton in 2003.

The company originally worked in paid search and added SEO in 2009.

One of the interesting parts of its early SEO work was the use of PR specialists for link building.

That approach has since become much more common.

A piece of research or a useful story can earn coverage from newspapers and industry websites. The resulting link may help SEO, while the coverage itself puts the brand in front of a wider audience.

Propellernet has worked with brands including Auto Trader, Superdry and Kuoni.

The agency also created AnswerThePublic in 2014.

The tool became widely used for finding questions and phrases connected with what people search for.

More recently, Propellernet has started working on visibility in AI-generated search results as well.

Unique Offerings

• SEO
• Digital PR
• Search research
• AI visibility
• Paid media
• Content-led campaigns

Official website: Propellernet

10. Hallam

Founded	1999
UK Offices	Nottingham, London
Ownership	Employee-owned
Current Focus	B2B

Hallam was founded by Susan Hallam in 1999.

The agency has therefore been working around search for longer than most of the other businesses in this list.

Its services later expanded into paid media, Digital PR, websites, creative work and analytics.

Hallam now concentrates much more heavily on B2B companies.

That changes how SEO results are judged.

A consumer website may need thousands of transactions.

A B2B company could consider one new customer valuable if the contract is worth hundreds of thousands of pounds.

Search volume and traffic still matter, but they have to be read alongside leads, pipeline and revenue.

Hallam’s SEO services cover technical work, content, international search, migrations and AI visibility.

The company became employee-owned in 2025 through an Employee Ownership Trust.

Unique Offerings

• B2B SEO
• Technical SEO
• International SEO
• Digital PR
• AI search
• SEO training
• Website migrations

Official website: Hallam

Frequently Asked Questions

Which are the top SEO companies in the UK?

Blue Array, Impression, Re, Builtvisible, SALT.agency, Found, Screaming Frog, Click Consult, Propellernet and Hallam are established SEO companies operating in the UK.

Which SEO companies specialise in technical SEO?

SALT.agency, Screaming Frog, Impression and Builtvisible all work extensively on technical SEO. Typical projects include crawling, indexing, site architecture, migrations and large website audits.

Which UK SEO company focuses on ecommerce?

Re focuses heavily on ecommerce SEO. The agency works on technical search, content and Digital PR for online retailers and other businesses where organic traffic needs to contribute directly to revenue.

Is Screaming Frog an SEO agency?

Yes. Screaming Frog operates an SEO and PPC agency from Henley-on-Thames. The company also develops Screaming Frog SEO Spider, its widely used website crawling tool.

Who owns Builtvisible?

Builtvisible became part of Brave Bison in 2025. It continues to operate under the Builtvisible name and works mainly across SEO, content and Digital PR.

What is GEO?

GEO stands for Generative Engine Optimisation. It deals with how content and brands appear in AI-generated answers and AI-based search experiences.

Does SEO still work after the growth of AI search?

Yes. AI has changed some search behaviour, but websites still need to be accessible, useful and trusted. Search engines and AI systems both rely on information they can find and understand.

Which SEO companies work with B2B businesses?

Hallam now concentrates heavily on B2B marketing. Other agencies on this list also work with B2B clients, although their main specialisms may be technical SEO, ecommerce or broader search.

How much does SEO cost in the UK?

SEO pricing depends on the website, competition and amount of work involved. A small technical audit costs very differently from a long-term enterprise programme involving content, Digital PR and development support.

What should I check before hiring an SEO agency?

Check whether the agency has handled a similar type of website before. Ask who will work on the account, what will be measured, how recommendations will be implemented and whether the agency’s strongest skills match the problem your website actually has.