Best London SEO Agencies for International Expansion

Many UK companies want an SEO company in London that can also run their European markets. A London agency makes sense when you want in-person workshops, UK business hours and specialists who know British search habits from daily life. Remote agencies can run UK programs well too, as long as they research British search behavior and report on UK results separately.

I run international SEO programs in English, French, German, Italian and Spanish for B2B SaaS companies, and I built my first agency in Spain with roots in translation and localization. I checked every agency below on its own website in October 2026 for its London presence, current services, markets and named clients.

London SEO agencies compared

Agency	Based in	Best for	Languages and markets (from its own site)
Flying Cat	Los Angeles, serving the UK and Europe	B2B SaaS expanding from the UK into France, Germany, Italy and Spain	English, French, German, Italian and Spanish
GA Agency	London	Consumer, fashion and travel brands across many European markets	18 languages, 26 markets
Blue Array	Reading, London, Seville	UK brands that want SEO plus digital PR	International organic search with linguistic expertise
Mintense	Verona, Lille, London, US	Companies coordinating several European markets under one strategy	16 campaign languages, 60+ countries
Pearl Lemon	London	UK businesses expanding into the US, Canada and Europe	UK, US, Canada and Europe
Adapt Worldwide	UK (a Welo Global brand)	Enterprise brands localizing at scale across many markets	80+ in-market specialists

1. Flying Cat

Flying Cat is the founder-led boutique I run from Los Angeles, with UK and European programs on UK-friendly call times. I lead the strategy on every account. Native linguists write and review the French, German, Italian and Spanish content, and our French coverage includes Belgium, Switzerland and Canada.

Our program for an ecommerce marketing platform covers the UK alongside France, Germany, Italy and Spain. The client grew its top-3 rankings in France 3.2x within six months and raised organic conversions in France 60% in year one (case study). For ActiveCampaign, we added 83,000+ non-branded clicks across four European languages in eight months (case study).

Flying Cat fits B2B SaaS teams that want a senior strategist on every call and native content in a few priority European markets. It is a poor fit if you need an office you can visit in London. See our international SEO service for scope and pricing.

2. GA Agency

GA Agency describes itself as an independent global digital marketing agency in London. Its site lists international SEO, international link building, generative engine optimization and answer engine optimization. GA Agency says its 60+ experts cover 26 markets and speak 18 languages natively, and it states that it uses native specialists instead of translation or outsourcing.

Named clients include Prada, Diesel, Calzedonia, Expedia, UniCredit, Technogym and Trip.com. GA Agency suits consumer, fashion and travel brands that need coverage across many European languages from a London base.

3. Blue Array

Blue Array is an SEO agency based in Reading with offices in London and Seville. Its services include organic search, digital PR for organic search and generative engine optimization. Its international organic search service combines technical work with cultural and linguistic expertise.

Client logos on its site include Zoopla, Pret, Boden, RAC and Simply Business. A featured case study for iwoca reports a 356% increase in non-branded organic traffic. Blue Array suits UK brands that want SEO and link-earning digital PR from the same team.

4. Mintense

Mintense runs native-language teams from Verona, Lille, London and the US. The agency reports 200+ international SEO projects across 60+ countries over 17+ years, with campaigns in 16 languages. Its international service covers audits, strategy, content creation, link building and ongoing optimization, and its site also lists multilingual paid ads and AI visibility work.

Mintense centralizes keyword research, technical architecture and link building, then reports performance market by market in a single monthly report. It suits companies entering several European markets that want one strategy and one point of contact instead of a separate vendor per country.

5. Pearl Lemon

Pearl Lemon is a London SEO agency with an international SEO service for UK businesses expanding into the US, Canada and Europe. Its service page covers hreflang repair, multilingual keyword research by market, site structure decisions and country-level reporting.

Pearl Lemon publishes its pricing. International campaigns start at £3,000 per month on a three-month minimum term. It suits UK small and mid-sized businesses taking their first step into a second English-speaking market or one European market.

6. Adapt Worldwide

Adapt Worldwide is a UK multilingual performance marketing agency and part of Welo Global, a localization services group. Its international organic search practice covers content SEO, technical SEO, app store optimization and AI SEO. On its content SEO page, Adapt describes a network of 80+ in-market specialists who produce and adapt content per market.

Adapt publishes one client story for a global technology brand across 7+ markets, with impressions up 595% and key events up 113% in six months. It suits enterprise brands that need SEO, paid media and localization across many markets through one vendor.

How to choose a London agency for international SEO

Ask who writes the content in each market. A native writer living in France or Germany knows local search phrasing and regulations, while a London team translating from English copy usually misses them. Request a sample page in your target language and have someone in your local sales or support team score it.

Ask to see results filtered by country. Search Console screenshots by country or language subfolder show whether the agency has moved a non-English market on its own, which a global traffic chart can hide.

Ask how the agency tracks AI search in each market. Buyers in Paris and Munich ask ChatGPT and Google AI Mode in their own language, so prompts should be written natively and run from each country. Our guide to choosing an AEO partner lists the questions to ask.

For the full set of checks I use, read how I vet international SEO agencies, which also covers agencies outside London.

Frequently asked questions

Do I need a London agency to rank in the UK

A London office helps with workshops and time zones. Rankings depend on the content, technical setup and local authority your agency builds for the UK market. Remote agencies can run UK programs well when they research British search behavior and report on UK results separately. For teams based elsewhere on the continent, see our list of SaaS SEO agencies in Europe.

What do London international SEO agencies cost

Pricing depends on the number of markets, the content volume per market and whether the agency handles technical work. Pearl Lemon publishes a starting price of £3,000 per month with a three-month minimum. Ask each agency how many pages per market its quote includes, who writes them and who reviews them in the market.

Can a UK site reuse its US content

It depends on the product and the market. Some pages carry over with UK spelling and examples, while pages tied to US law, pricing or buyer habits need a rewrite. We decide page by page during the audit at the start of every international program.

Talk to us about your markets

If you are planning a move from the UK into France, Germany, Italy, Spain or another French-speaking market, I can review your current setup and show you where your first gains would come from. Book a call and tell me which markets you are targeting.

Maeva Cifuentes

Founder and CEO of Flying Cat. She leads SEO and AI search strategy for B2B SaaS companies including D2L, Klaviyo, CoVet and Blue J.