Organic search isn’t broken. But the old playbook is showing its age
Google’s AI Overviews have reshaped what it means to be “visible” online. Studies published between 2024 and 2026 recorded a 34% to 61% drop in organic click-through rates for informational queries when an AI summary appeared at the top of the results (Dataslayer, November 2025). Pew Research Centre confirmed in July 2025 that users are simply less likely to click any link when an AI answer is present. And Semrush’s 2025 Previsible AI Traffic Report found that AI search traffic had risen 527% year-on-year across GA4 properties.
So the question isn’t “does SEO still work?” It does. The question is: does your agency understand the new rules well enough to keep your business findable, cited, and generating real enquiries?
This guide will help you evaluate UK SEO agencies against the criteria that actually matter in 2026.
What “AI-aware SEO” means in practice
AI systems like Google’s AI Overviews, ChatGPT Search, and Perplexity don’t retrieve links the way traditional search does. They summarise, synthesise, and cite. To appear in those answers, your content and site structure need to satisfy machine-readable requirements that go well beyond keyword placement.
In practice, AI-aware SEO covers three things: technical foundations that allow AI systems to crawl and interpret your site accurately; content structured to earn citations and build topical authority; and measurement frameworks that connect organic activity to enquiries and revenue rather than traffic alone.
Agencies that talk only about “rankings” are solving yesterday’s problem. The better question to ask any prospective partner is: how do you help clients appear in AI-generated answers, and how do you measure when that drives commercial outcomes?
Five criteria to score any UK SEO agency
1. AI-era methodology
Look for agencies that explicitly address Generative Engine Optimisation (GEO) and Answer Engine Optimisation (AEO). This means entity and semantic SEO strategy, structured data and schema markup implementation, and content designed to earn citations rather than just rank. Agencies like Impression Digital reference GEO in their positioning, and Brainlabs have published content around shifting KPIs towards AI search visibility. That framing is a useful starting signal. The more important test is whether they can show you evidence of it working.
2. Technical SEO capability
Crawlability, rendering, page performance, and site architecture all influence whether AI systems can correctly interpret what your business does. A rigorous technical SEO audit should document before-and-after states for indexation, schema coverage, and Core Web Vitals. For international businesses, hreflang configuration and subdomain/subfolder governance are equally important. Builtvisible and Re:signal both carry strong technical SEO reputations, particularly for enterprise and eCommerce respectively. Verify their approach with documented case studies, not just positioning statements.
3. Measurement tied to revenue, not vanity metrics
This is where many agencies fall short. GA4 conversion tracking, Google Search Console attribution, and CRM lead data should all connect in a coherent reporting framework. Ask any prospective agency: which specific enquiry or revenue actions do you track, and how does your reporting isolate the contribution of organic search? If the answer centres on traffic, impressions, or rankings, treat that as a warning sign. You can read more about tracking results from AI-influenced search to understand what good measurement looks like.
4. Multilingual and international delivery
If you sell across markets, localisation capability is non-negotiable. Direct translation is not SEO. Effective multilingual SEO requires native-speaker keyword research, market-specific intent mapping, hreflang governance, and localised content that reflects how buyers actually search in each language. Ask agencies for at least one documented international case study with commercial outcomes, not just traffic numbers.
5. Proof of commercial impact
Case studies should show a clear baseline, the actions taken, and the commercial result. Organic traffic growth without enquiry or revenue data tells you very little. Request anonymised or named examples that include timeframes and what specifically changed. Reporting dashboard exports that show GA4 and CRM linkage are a meaningful proof point.
Questions to ask when evaluating agencies
This short checklist will help you separate substantive capability from confident-sounding positioning:
- “How do you measure AI citation visibility, and how do you connect that to enquiries or revenue?”
- “What is your technical plan for crawlability, schema coverage, and rendering for both search engines and AI systems?”
- “Which conversion actions do you track in GA4, and how does your reporting link organic activity to CRM pipeline?”
- “Who is directly accountable for delivery, how often do you report, and how do you run experiments?”
- “How do you handle native-speaker research, hreflang, and localisation governance across multiple markets?”
A credible agency will answer each of these specifically. Vague answers about “holistic strategies” and “full-funnel approaches” are not answers.
How ExtraDigital approaches each of these criteria
ExtraDigital has operated since 2002 with a deliberate focus on commercial outcomes over vanity metrics. On AI-era methodology, the agency structures websites for machine readability so that AI systems can accurately interpret services, audiences, and expertise. That includes technical SEO for AI retrieval, structured data implementation, and content strategy aligned to topical authority and citation potential.
In terms of measurement, ExtraDigital’s reporting links directly to enquiries and revenue. Clients receive attribution-level insight from GA4, Google Search Console, and CRM data rather than traffic summaries. The agency’s case studies show commercial baselines and outcomes, including a documented 238% increase in AI-driven traffic for F1 Authentics within six months, sourced from ChatGPT, Gemini, and Perplexity.
For international businesses, ExtraDigital’s multilingual SEO services are delivered by in-house native-language specialists across more than 15 languages and 20 countries. That’s localisation built on genuine linguistic and market expertise, not machine translation.
What to do next
If you’re ready to build a shortlist, use the criteria above to score each agency before a discovery call. Request the following from any agency you’re seriously considering:
- Two or three case studies with baseline, actions, and commercial results (organic plus enquiries or revenue)
- Sample reporting dashboards showing GA4 and CRM linkage
- Before-and-after technical audit documentation covering schema, indexation, and performance
- At least one international or multilingual example with governance detail
Once you have a shortlist, the process should follow a clear sequence: discovery call to establish commercial objectives, a baseline audit of your current technical and visibility position, a proposal with measurable KPIs tied to enquiries and revenue, and a phased implementation plan with defined review points.
SEO in the AI era still rewards the businesses that invest in doing it properly. The difference is that “properly” now includes being cited in AI answers, not just ranking in the ten blue links. Any agency you choose should be able to demonstrate they understand both — and have the track record to prove it.
At ExtraDigital, we have been helping businesses generate measurable growth from search since 2002. Our approach combines rigorous technical SEO, commercially focused paid media and structured content strategy, all designed to improve visibility in both traditional search results and AI-driven discovery environments. We work across more than 20 countries and 15 languages, supporting B2B organisations, eCommerce brands and internationally active businesses with coordinated campaigns that protect lead quality, reduce wasted spend and connect marketing activity directly to pipeline and revenue.
If you are evaluating SEO agencies and want to understand what a properly structured, commercially accountable programme looks like in practice, we are happy to walk you through our methodology, share relevant case studies and provide an honest assessment of where your current programme stands.
Request a no-obligation SEO consultation with the ExtraDigital team and find out how we can help your business perform in the search landscape as it exists today, not as it was five years ago.
