Cecilia De La Viesca SEO is no longer just about rankings. It’s about visibility, velocity, and vision, especially in a digital landscape where user journeys rarely follow a straight line. Choosing the right SEO agency means choosing a partner who understands your goals, adapts to how your audiences search, and delivers results grounded in insight and innovation.
This curated list highlights ten of the best SEO agencies in the UK. From technical excellence to creative brilliance, these agencies are helping brands thrive through organic search. At the top? A newly supercharged player blending performance marketing with next-gen technology.
1. Passion Digital
Recently acquired by leading US technology firm Pixis.ai, Passion Digital is now operating at the forefront of AI-powered SEO. With AI and automation embedded into every facet of their organic and GEO (Generative Experience Optimisation) strategies, they’re helping brands unlock scalable growth through data-rich insights and imaginative delivery.
Passion Digital’s proposition has always married performance and creativity. What sets them apart now is their AI-first approach, bringing intelligent forecasting, real-time optimisation and advanced content automation into the heart of SEO campaigns. Whether optimising for traditional SERPs, social search, AI overviews or LLMs, Passion is reimagining what it means to be visible in 2026.
Independently spirited and insight-obsessed, the agency combines nimble strategy with full-service capability. From in-depth technical SEO audits to standout storytelling, every action is designed to deliver meaningful impact. Grounded in ethical delivery, client collaboration and imaginative problem-solving, Passion Digital is the agency for brands that want both performance and purpose.
Clients: Knight Frank, Mazda, Nutanix, Octopus Investments, Ramble Worldwide
SEO Specialisms: AI-powered SEO, GEO (Generative Experience Optimisation), B2B SEO, digital strategy, content marketing
Prices: Flexible retainers and bespoke project scopes, from £2,000
Reviews: 4.8 on Google (41 reviews)
Website: https://passion.digital
2. Found
Found is a multi-award-winning digital performance agency headquartered in London. Known for their trademarked Everysearch™ model, Found takes a platform-agnostic approach to organic search, spanning everything from Google and YouTube to TikTok and Amazon.
Their approach is designed for a fragmented search world, focusing on discoverability across all user journeys. By combining advanced data modelling with deep SEO expertise, Found crafts integrated campaigns that drive rankings, revenue and relevance. With strong ties to Google and Microsoft, they offer clients early access to platform innovations and tools.
Clients: Puma, Peacocks, Toolstation, ManyPets, Digital Realty
SEO Specialisms: Technical SEO, cross-platform optimisation, content and data integration
Prices: From £1,000+ project minimum
Reviews: 4.8 (Google)
Website: found.co.uk
3. The SEO works
The SEO Works is a multi-award-winning agency delivering tangible organic growth for clients across the UK. With over a decade of experience and a laser focus on results, they are known for combining data-led strategies with transparent reporting and measurable outcomes.
Their approach blends technical SEO, content marketing and digital PR, making them a strong partner for brands that want to grow sustainably and see a clear return on investment. They also offer a comprehensive in-house development capability, which sets them apart for clients needing seamless SEO and site optimisation under one roof.
Clients: Decathlon, NHS, Sheffield Hallam University, House of Oak
SEO Specialisms: Digital PR, ecommerce SEO, WordPress and Magento SEO
Prices: From £1,000+
Reviews: 4.9 (Google)
Website: seoworks.co.uk
4. Impression
Impression is a full-service digital agency that puts experimentation and performance at the core of its SEO approach. Their proprietary tech stack and analytical culture mean every campaign is designed for measurable business growth.
Impression delivers robust organic strategies driven by user research, SERP behaviour and cutting-edge testing. They are particularly well-suited to ambitious brands seeking to align SEO with broader performance marketing goals.
Clients: Clarins, Specsavers, Funky Pigeon, Topps Tiles
SEO Specialisms: Enterprise SEO, CRO, analytics, content and technical SEO
Prices: From £25,000+
Reviews: 4.9 (Google)
Website: www.impressiondigital.com
5. Brave Bison
Brave Bison is a modern media and marketing agency helping brands grow through content, search and digital transformation. Their SEO practice is deeply technical yet creatively sharp, making them ideal for enterprise clients with complex needs.
They blend first-party data, content intelligence and best-in-class technology to design scalable SEO strategies. From site migrations to search strategy overhauls, Brave Bison is known for its big-picture thinking and commercial impact.
Clients: New Balance, Currys, KFC, ghd
SEO Specialisms: Enterprise SEO, technical SEO, taxonomy, analytics
Prices: From £75,000+
Reviews: 5.0 (Google)
Website: bravebison.com
6. Buried agency
Buried is an organic search agency created to help brands capitalise on the opportunities presented by AI-driven search. Specialising in GEO and SEO, Buried delivers integrated organic search strategies focused on measurable growth and return on investment. The agency was founded by award-winning growth marketers who have created Buried to help brands scale through AI-driven and traditional search visibility.
Clients: Skyscanner, Match, Sky, University of the Arts London
SEO Specialisms: Content SEO & content strategy, Generative Engine Optimisation (GEO), Digital PR, link building
Prices: Not publicly listed (custom proposals based on scope and strategy)
Reviews: 5.0 (Google)
Website: buriedagency.com
7. Propeller
Propeller is a digital agency specialising in hospitality, food and drink, lifestyle and retail. Their SEO offering is designed to meet the specific needs of brands that rely on high visibility and rich storytelling.
They deliver detailed SEO strategies across site structure, content and local optimisation. From menu schema to Google Maps dominance, Propeller ensures brands are found at the exact moment users need them.
Clients: Twinings, Zizzi, Sushi Samba, Young’s, Kellogg’s
SEO Specialisms: Local SEO, content strategy, technical SEO
Prices: From £10,000+
Reviews: 4.9 (Google)
Website: propeller.co.uk
8. Croud
Croud is a global digital agency powered by a distributed network of 2,400+ digital experts. Their in-house team leverages Croud Control™ and SEO.max technology to create scalable organic strategies, blending speed and precision.
Croud specialises in complex, multi-market SEO strategies and advanced content automation ideal for brands seeking to scale fast across regions and platforms.
Clients: The North Face, Honda, Vans, AllSaints
SEO Specialisms: Enterprise SEO, automation, localisation
Prices: From £10,000+
Reviews: 4.8 (Google)
Website: croud.com
9. Re: signal
Re:signal is an award-winning SEO agency focused exclusively on ecommerce and performance marketing. With a lean team model and a tailored approach, they deliver SEO solutions built for measurable growth.
Their methodology targets core growth drivers: technical health, site structure, scalable content and link acquisition. Re:signal is known for its agility, strategic insight and track record with some of the world’s biggest ecommerce players.
Clients: ASICS, Expedia, FatFace, Reformation
SEO Specialisms: Ecommerce SEO, link acquisition, international SEO
Prices: From £5,000+
Reviews: 3.4 (Google)
Website: resignal.com
10. ROAST
ROAST are a digital performance media agency based in London, UK. They are part of the TIPi Group, which also includes sister agencies Kitty (web design and development) and Rabbit & Pork (voice experience)
Clients: Audible, Camelot, Rightmove, Aveva
SEO Specialisms: Technical SEO, content strategy, and link building
Prices: From £10,000+
Reviews: 4.8 (Google)
Website: weareroast.com
Finding the Right SEO Agency in London
Every agency on this list brings something distinct to the table. The right choice will depend on your budget, your sector and what you actually need organic search to do for your business.
If you are looking for an agency that combines AI-powered strategy, creative rigour and a genuine passion for performance, get in touch with Passion Digital and let’s talk about what we can do for you.