The State of AI Search in UK B2B [2026 Research]

AI Search Adoption: B2B Is Ground Zero

B2B adoption of AI search has outpaced consumer adoption by a factor of three. Forrester's 2024 Buyers' Journey Survey (n=18,000) found 89% of B2B buyers have adopted generative AI, while 6sense's 2025 Buyer Experience Report (n=3,974) confirmed 94% used LLMs during purchasing. ChatGPT reached 900 million weekly active users by February 2026 (OpenAI), with UK visits growing 389% year-on-year to 1.8 billion in eight months (Ofcom Online Nation 2025). Google AI Overviews now reach 2 billion monthly users across 200+ countries, having launched in the UK in August 2024.

Yet a stark gap exists. DSIT's AI Adoption Research (January 2026, n=3,500) reveals only 16% of UK businesses currently use at least one AI technology — while 89% of their B2B customers are using it to choose suppliers. Google's global search share fell below 90% for the first time since 2015 (StatCounter), and for general information queries specifically, Google's share dropped from 73% to 66.9% between February and August 2025, with ChatGPT capturing 12.5%. AI search platforms collectively reached 7.5 billion monthly visits in August 2025 — up 150% year-on-year.

How Each AI Search Platform Retrieves and Cites Sources

All major platforms use Retrieval-Augmented Generation (RAG) — combining real-time web retrieval with large language model generation — but their implementations differ profoundly, creating divergent citation ecosystems. Google AI Overviews use a "query fan-out" technique, conducting multiple simultaneous sub-searches across its index and Knowledge Graph. ChatGPT Search uses the Bing web index, with 87% of citations matching Bing's top results (Seer Interactive). Perplexity re-searches the live web for every query across 200+ billion URLs, averaging 5–22 citations per answer. Claude uses Brave Search, while Microsoft 365 Copilot adds an organisational data layer via Microsoft Graph — and Forrester found Copilot is the most widely used AI tool among business buyers at 68%, with 36% using a private corporate instance invisible to any external analytics.

The most critical finding for B2B strategy: Profound's analysis of 680 million citations found only ~11% domain overlap between ChatGPT and Perplexity. Each platform has a distinct citation personality — ChatGPT favours encyclopaedic sources (Wikipedia at 7.8%), Google AI Overviews favours community and professional content (Reddit, YouTube, LinkedIn), and Perplexity heavily weights community content (Reddit at 6.6%). A brand optimising for only one platform will be invisible on the others.

The B2B Buyer Journey Is Being Rewritten

AI search has already become the primary starting point for B2B vendor discovery. A Treble/Censuswide survey of 300 CIOs, CISOs, and CTOs (December 2025) found that 47% of enterprise technology buyers now initiate vendor research with AI assistants — ahead of Google Search (43%), vendor websites (42%), and trade publications (40%). G2's Buyer Behavior Report (n=1,169) found genAI chatbots are the number-one source influencing vendor shortlists at 17.1%, surpassing software review sites (15.1%), vendor websites (12.8%), and salespeople (8.8%).

The pre-contact favourite wins approximately 80% of deals (6sense 2025), and 95% of winning vendors are on the buyer's Day One shortlist — up from 85% in 2024. Buyers fill 3.6 of roughly 5 vendor slots before any human contact occurs. The critical question: who shapes that Day One shortlist? Increasingly, it is AI. When 47% of enterprise buyers start with AI assistants and genAI chatbots are the top shortlist influencer, vendors recommended by AI tools have a structural advantage before any sales interaction.

Trust is building rapidly. TrustRadius reports 80% of B2B buyers trust AI-generated content at least some of the time — up 19 percentage points year-on-year. The Treble study found buyers trust AI-generated vendor summaries more than vendors' own website claims. The "dark funnel" is expanding dramatically: when a procurement lead asks ChatGPT to compare vendors, or a CFO uses Microsoft Copilot behind a corporate firewall, zero engagement signals reach any vendor. Forrester found AI-referred visitors are one-tenth as likely to click through to a vendor's website. Traditional attribution is breaking down.

Citation Is the New Ranking — And the Rules Are Different

SparkToro and Gumshoe.ai's January 2026 study (2,961 prompts, 600 volunteers) delivered a finding that upends AI search strategy: there is less than a 1-in-100 chance that ChatGPT or Google's AI will return the same brand recommendation list in any two responses. Rand Fishkin's conclusion: "any tool that gives a 'ranking position in AI' is full of baloney." However, visibility percentage — how often a brand appears across many prompt runs — proved stable and trackable. B2B brands should measure Share of AI Voice, not position.

What Content Gets Cited

SE Ranking's study of 129,000 unique domains (November 2025) identified the strongest citation predictors. Referring domains (backlinks) remain the single strongest signal — sites with 32,000+ referring domains are 3.5× more likely to be cited. Review site presence (G2, Capterra, Trustpilot) provides a 3× citation advantage. Page speed matters: pages with First Contentful Paint under 0.4 seconds average 6.7 citations versus 2.1 for slower pages. And 95% of citations come from content published in the last 10 months, with content updated within 30 days receiving 3.2× more citations.

For B2B software queries, G2, Capterra, Software Advice, and GetApp collectively command 84% of review-platform citations in ChatGPT (Omniscient Digital). G2's pending acquisition of Capterra, Software Advice, and GetApp (agreed January 2026) is projected to increase bottom-of-funnel citation share by 76%. Active review profiles on these platforms are now a citation prerequisite for any B2B software company, not a nice-to-have. UK domains (.co.uk) represent just 2.16% of ChatGPT citations globally (Profound), but an Oxford Internet Institute study confirmed ChatGPT systematically favours English-speaking regions — creating a structural advantage for UK content that is optimised for citation.

Less Traffic, Higher Value: The Conversion Paradox

The impact on organic click-through rates is severe. Ahrefs (300K keywords, February 2026) found AI Overviews correlate with 58% lower average CTR for the top-ranking page. Seer Interactive (25.1M organic impressions) found organic CTR plummeted 61% — from 1.76% to 0.61% — for queries with AI Overviews. Paid CTR crashed 68%. UK publishers submitted evidence to the CMA showing a 47.5% desktop CTR drop. The UK B2B impact is disproportionate: AI Overviews appear for 54% of B2B keywords versus only 22% of B2C keywords (ROAST UK). B2B informational content sits directly in the blast zone.

Sources: Ahrefs (300K keywords, Feb 2026), Seer Interactive (25.1M impressions, Nov 2025), SparkToro/Datos (2024), Similarweb/Bain (2025)

The Conversion Paradox

The counterbalancing finding — and the one that defines the strategic opportunity — is that AI-referred traffic converts dramatically better. Seer Interactive found ChatGPT referral traffic converts at 15.9% and Perplexity at 10.5%, versus Google organic at 1.76% — a 4–9× conversion premium. Semrush (12M visits) confirmed average LLM visitors convert at 4.4× the rate of organic visitors. Adobe Analytics reports 23% lower bounce rates and 41% longer sessions from AI referrals. Absolute volumes remain small — AI search accounts for less than 1% of total referral traffic (BrightEdge, August 2025) — but AI referral traffic grew 527% year-on-year. The brands cited in AI Overviews earn 35% more organic clicks and 91% more paid clicks (Seer Interactive), making citation a multiplier for all channels.

UK Regulation: The Most Active Intervention in the World

The UK has taken the most decisive regulatory action of any jurisdiction on AI search. The Digital Markets, Competition and Consumers Act 2024 (DMCCA) came into force on 1 January 2025, and on 10 October 2025, the CMA formally designated Google with Strategic Market Status for general search services — the first SMS designation under the Act. The designation covers Google Search, search advertising, AI Overviews, and AI Mode, lasting five years with breach penalties reaching 10% of global turnover.

The CMA found Google earns £3–4 billion in supernormal profits from UK search services annually, with 200,000+ UK firms spending over £10 billion on Google search advertising in 2024. Google's own internal research, disclosed during the investigation, shows that reducing publisher content in search results reduces traffic by 45%. For B2B marketers, the proposed publisher opt-out from AI Overviews could reshape the content landscape, and the fair ranking requirements may level the playing field for smaller brands currently disadvantaged by domain authority signals.

What This Means for UK B2B Marketers

Citation has replaced ranking as the primary visibility metric. Princeton and Georgia Tech research demonstrates that Generative Engine Optimisation (GEO) strategies can increase AI visibility by ~40%. The core shift: SEO competed for 10 blue links; AEO competes for 2–7 citation slots per AI response. An arXiv paper (September 2025) found AI search exhibits "systematic and overwhelming bias towards earned media over brand-owned content" — meaning review sites, industry publications, and expert commentary matter far more than your own website alone.

Marketing budgets remain flat at 7.7% of revenue for a second consecutive year (Gartner, 402 CMOs including UK), with 59% of CMOs reporting insufficient budget. The skills gap is acute — Marketing Week found 75.8% of UK marketers identify AI expertise as a major gap, yet only 5% are actively building GEO capabilities. Workers with AI skills command a 43% wage premium (PwC), up from 25% a year earlier. Only 16% of brands systematically track AI search performance (Passionfruit). The brands cited in AI Overviews earn 35% more organic clicks and 91% more paid clicks — making citation tracking not merely a measurement question but a revenue imperative. Answer engine optimisation is how UK B2B companies bridge the gap between traditional SEO and AI search visibility.

Frequently Asked Questions

How many B2B buyers use AI search in 2026?

94% of B2B buyers used LLMs during the purchasing journey in 2025 (6sense, n=3,974), up from 89% in 2024 (Forrester, n=18,000). GenAI chatbots are now the number-one source influencing vendor shortlists at 17.1%, ahead of review sites (15.1%) and vendor websites (12.8%). In the UK specifically, buying cycles have compressed 20% from 10 to 8 months while the number of vendors evaluated has increased from 4 to 5.

How much has organic CTR dropped because of AI Overviews?

Organic click-through rates drop 58–61% when AI Overviews appear, based on independent studies from Ahrefs (300K keywords) and Seer Interactive (25.1M impressions). Position 1 CTR for informational keywords fell from 7.6% to 3.9% between December 2023 and December 2025. Paid CTR dropped 68%. UK publishers reported a 47.5% desktop CTR drop in evidence submitted to the CMA. The impact is disproportionately heavy for B2B content, with 54% of B2B keywords triggering AI Overviews compared to 22% of B2C.

Does AI search traffic actually convert better?

Yes — significantly. ChatGPT referral traffic converts at 15.9% and Perplexity at 10.5%, versus Google organic at 1.76% (Seer Interactive). Semrush confirmed a 4.4× conversion rate advantage for LLM-referred visitors. Adobe Analytics reports 23% lower bounce rates and 41% longer sessions. However, absolute volumes remain small — AI referrals account for less than 1% of total traffic — though they grew 527% year-on-year. The pattern is clear: fewer visitors, but far more commercially valuable.

What is the CMA doing about AI search in the UK?

The CMA designated Google with Strategic Market Status in October 2025 under the DMCCA — the first such designation. Proposed conduct requirements include allowing publishers to opt out of AI Overviews without losing search visibility, fair ranking obligations for AI-generated results, mandatory search choice screens, and data portability. Breach penalties reach 10% of global turnover. Implementation is expected in H1 2026. The CMA found Google earns £3–4 billion in supernormal profits from UK search annually.

How should UK B2B companies prepare for AI search?

The immediate priorities are: audit your current AI search visibility across ChatGPT, Perplexity, and Google AI Overviews; ensure active profiles on B2B review platforms (G2, Capterra, Trustpilot); front-load definitive answers in the first 30% of key content; keep content updated within 10 months (ideally 30 days); invest in answer engine optimisation alongside traditional SEO; and establish measurement frameworks for AI Share of Voice. Only 11% of companies have AI-discovery-ready content — this is a first-mover window that is closing fast.