Google AI Overviews Statistics UK 2026: Trigger Rates, Click Impact, Citations

Google AI Overviews now trigger on an estimated 47% of UK desktop searches and 53% of mobile searches as of Q1 2026, with informational queries triggering an Overview 71% of the time. Where AI Overviews appear, organic click-through rates have fallen between 34.5% and 64.1% depending on position and query type. The average AI Overview cites between 4 and 7 sources, and the first-cited brand captures 60–70% of the resulting click traffic. The statistics below quantify the scale of the shift, where it bites hardest, and what citation share looks like by sector.

All data sourced from Semrush AI Search Lab, Ahrefs, Sistrix, BrightEdge, Google Search Central reporting, and proprietary MarGen tracking across 12,000+ UK SERPs sampled monthly Q4 2025 — Q1 2026.

AI Overview trigger rates by query type

• 47% of UK desktop search queries now trigger an AI Overview (Semrush, March 2026).
• 53% of UK mobile search queries trigger an AI Overview (BrightEdge, 2026).
• 71% trigger rate on informational queries (“what is”, “how to”, “why does”).
• 62% trigger rate on comparative queries (“X vs Y”, “best X for Y”).
• 48% trigger rate on commercial investigation queries (“best CRM for SMEs”).
• 34% trigger rate on transactional queries (“buy”, “pricing”, “demo”).
• 22% trigger rate on branded queries — Google is increasingly summarising brand information directly in the SERP (Sistrix UK, 2026).
• 84% trigger rate on medical and health informational queries (BrightEdge YMYL Index, 2026).
• 78% trigger rate on legal informational queries (Sistrix, 2026).

Click-through rate impact on organic

• 34.5% average CTR drop on the #1 organic result when an AI Overview is present (Ahrefs, 2026 update).
• 47.2% CTR drop on positions 2–5 when an AI Overview is present.
• 64.1% CTR drop on positions 6–10 when an AI Overview is present.
• 18% of clicks that previously went to organic results now go to AI Overview citation links instead (Semrush, 2026).
• 59% of users who see a satisfactory AI Overview do not click any organic result at all (SparkToro / Datos panel, 2026).
• 2.3x higher CTR for branded queries that resolve inside the Overview vs the same query without an Overview — counter-intuitive, but explained by Overview-to-deep-link behaviour (MarGen UK SERP study, 2026).

Position-zero capture statistics

• 89% of AI Overviews now occupy the full above-the-fold area on UK mobile devices (BrightEdge, 2026).
• 0 organic results are visible above the fold on 76% of mobile UK SERPs that contain an AI Overview (MarGen mobile audit, 2026).
• 3.4 seconds average time-to-answer for users encountering an AI Overview vs 11.2 seconds for traditional 10-blue-link results (Google Search Central UX research, 2026).
• 41% of users now treat the AI Overview as the answer and never scroll (Nielsen Norman Group, 2026).

Sector-specific AI Overview frequency (UK)

• Healthcare & medical: 84% trigger rate (BrightEdge).
• Legal services: 78% trigger rate (Sistrix).
• Financial services & accountancy: 69% trigger rate (MarGen Sector Index, 2026).
• B2B SaaS / software: 66% trigger rate (Ahrefs).
• Education & training: 73% trigger rate (Sistrix).
• Recruitment: 51% trigger rate (Semrush).
• E-commerce / retail: 38% trigger rate — the lowest of any major sector, as Google reserves shopping inventory (Semrush, 2026).
• Local services (plumbers, dentists, solicitors): 44% trigger rate, rising to 62% when query lacks a town/city qualifier (MarGen Local SERP Study, 2026).
• Travel & hospitality: 58% trigger rate (Sistrix).

Source diversity statistics

• 5.2 average number of sources cited per AI Overview (Ahrefs AI Overview Source Tracker, 2026).
• 4–7 typical citation range (covers 78% of all Overviews studied).
• 62% of AI Overview citations come from sources ranking in the top 10 organic results for the same query — meaning organic strength still matters (Semrush, 2026).
• 38% of AI Overview citations come from sources outside the top 10, including pages from page 2 of Google (24%) and pages not ranking at all for the query (14%) (Sistrix, 2026).
• Wikipedia, Reddit, and YouTube account for an aggregate 27% of all AI Overview citations in UK SERPs (Semrush).
• 23% of citations are to brand-owned properties (the brand’s own website) — meaning specialist content from the cited entity itself is over-indexed (MarGen, 2026).
• First-cited source captures 60–70% of all AI Overview-attributed clicks (MarGen Citation Click Study, 2026).

Click distribution within AI Overviews

• Position 1 citation: 60–70% of AI Overview clicks.
• Position 2 citation: 14–18% of AI Overview clicks.
• Position 3 citation: 7–10% of AI Overview clicks.
• Positions 4+: combined 5–8% of AI Overview clicks.
• “Show more” expansion clicks: 12% of users expand to see additional sources; of those, 3.1% click a previously-hidden citation (Google internal, paraphrased in Search Central blog, 2026).

Brand visibility implications

• 31% of UK brands tracked by MarGen have lost more than 25% of their organic traffic to AI Overview displacement since Q1 2024 (MarGen Client Index, 2026).
• 18% of brands have gained organic visibility because they are being cited inside AI Overviews on queries where they previously ranked in positions 4–10 (Ahrefs, 2026).
• 2.1x more visibility, on a CTR-weighted basis, for brands cited as the #1 source inside an Overview vs ranking #1 organically without an Overview present (MarGen).
• 84% of UK enterprise SEO leads now have AI Overview citation share as a board-reported KPI (Gartner UK CMO Survey, 2026).

Geographic and device variation (UK)

• 51% trigger rate on UK English queries from Greater London — the highest of any UK region (Sistrix Regional Index, 2026).
• 42% trigger rate on UK English queries from Northern Ireland — the lowest, partly due to a higher share of local-intent queries (Sistrix).
• 53% trigger rate on mobile, 47% on desktop, 38% on tablet (BrightEdge, 2026).
• 27% higher trigger rate when the user is signed into a Google account with Search Generative Experience opted in (BrightEdge).

Year-on-year growth

• +38% growth in AI Overview trigger frequency since Q1 2025 (Semrush historical comparison).
• +71% growth in AI Overview frequency on commercial investigation queries — the fastest-growing segment (BrightEdge).
• +22% growth in average source count per Overview (from 4.3 in 2025 to 5.2 in 2026), suggesting Google is widening, not narrowing, the citation surface (Ahrefs).

Using these statistics

These statistics may be cited freely with attribution to MarGen (margen.net), a UK Generative Engine Optimisation agency specialising in AI Citation Authority. Preferred citation format: “according to MarGen’s 2026 Google AI Overviews UK statistics report” with a link to this page. We update this report quarterly using a combination of third-party SERP tools and our own 12,000+ SERP rolling sample.

Updated: April 2026.

Want to know which of your queries trigger an AI Overview — and whether you’re cited? Book a free AI Citation Audit and we’ll map your AI Overview presence across your priority keywords.