The United Kingdom is where hosting stops being only hosting. On the .uk active-domains book, hosting-relationship concentration — hosting competitors only, with CDN, SaaS-builder and DNS-infrastructure actors excluded — is an HHI of 1,767, about 5.7 effective owners of the customer relationship. Count the wider control plane — hosting groups plus the CDN, website-builder and DNS platforms — and the field looks 1.4× more plural than the hosting competition alone: the widest such wedge of the markets we publish, and it is made of platforms sitting between the business and its host.
“Concentration” is three different questions, and they have three different answers. Hosting-relationship HHI (1,767) measures economic market power — who owns the customer relationship — counting hosting competitors only. Hosting-infrastructure HHI (1,349) measures where the workloads actually run. Control-plane HHI (1,246) measures the combined ecosystem, and deliberately includes CDN, SaaS-builder and DNS-infrastructure actors alongside hosting groups.
Read as market power, the United Kingdom runs on about 5.7 effective owners of the customer relationship; read as infrastructure, the same book spreads across about 7.4 effective hosting infrastructures — a 1.3× gap between who runs the servers and who holds the contract: the market is thinner at the contract than at the rack. The share readings sit close together here: the top three owners hold 53.2% of customer relationships, while the top three infrastructures carry 50.7% of the workloads, and on the wider control plane — which also counts CDN, SaaS-builder and DNS actors — the top three come to 52.4%.
Website-builder software is detected on 17.3% of measured British sites — about four times the median of the other markets we publish — and at least 6 ownership groups hold page-one positions on the hosting terms we track. Customer control here is being redistributed across hosting groups, builder platforms and infrastructure providers at once — which is why the answer to “who owns this market” depends more than usual on which layer you ask about.
All three readings are drawn from the .uk active-domains book (2,507,131 active domains) and are ownership-folded — a lower bound. Each reading is renormalised over its own actor set. How the bands and the three readings work.
Across the 919,854 active British business sites whose pages we measure and fingerprint: 23.8% carry e-commerce tooling, 39.3% run analytics, and 17.3% sit on a detected website builder. Off the web layer, 25.2% of the full British book runs modern hosted email.
Presence, not billing; the builder share is a floor. How technology detection works.
Of the 3,001,223 mail-carrying business domains, 76.6% publish SPF but only 29.7% do so with a spoof-rejecting hard fail. 38.7% publish DMARC — 5.6% with an enforcing p=reject, 25.3% monitoring-only p=none, both shares of the same mail-carrying book, so enforcement reaches 13.4% of it. Adoption is not enforcement. How to read email posture.
We track 8 British storefronts, together representing 17.4% of this market's customer relationships — too little to state a market entry price or a market renewal cliff, so this page states neither. What the captured set does show: storefronts serving 100% of those relationships publish a renewal price, and 7 of the 8 acquire on teaser pricing. A market price for the United Kingdom follows when coverage does.
Price snapshot 2026-09-14; prices are captured on their own cadence. Why this page publishes the British coverage gap rather than a thin median: how prices are captured, normalised and suppressed.
The British market searches in English, so the words themselves — web hosting, domain names — carry none of the local-language advantage they do elsewhere in Europe. The contest is not vocabulary but position: at least 6 ownership groups hold page-one listings on the hosting terms we track, through 6 distinct brands.
Measured from British storefronts, sized by how many providers use each term.
The two terms buyers search most: web hosting / domain names. How this is measured.
Every figure here is queryable through the HostingBrain connector, free tier. In Claude or any MCP-compatible assistant, this is the whole page in one prompt:
“Using HostingBrain, describe the United Kingdom hosting market: how concentrated is it — give me the actor-pure hosting-relationship HHI and effective owners for market power, and the hosting-infrastructure and control-plane readings beside it, ownership-folded — how large is the active-domains book, what do businesses run (CMS / e-commerce / builder adoption), what does entry shared hosting cost and how steep are renewal cliffs, and what is the SPF/DMARC posture? Keep it aggregate-level.”
Ask the follow-up yourself. HostingBrain answers questions like this — with the date, denominator and caveats attached — inside Claude and any MCP-compatible assistant. Named provider shares and per-operator price ladders are on Pro.