British buyers increasingly start their research in two places at once: a classic Google results page and an AI-generated answer, whether that is an AI Overview, Gemini, ChatGPT, Copilot or Perplexity. A London accountancy firm, a Manchester logistics company and a Bristol software start-up all face the same question: when someone asks for a supplier like them, will their website be understood, trusted and cited?
Technical SEO is the foundation that makes this possible. It does not replace good content or a strong reputation, but it decides whether search engines and AI systems can find, read and correctly interpret what you publish. This checklist is written for UK business websites and covers the essentials, the UK-specific details people often miss, and the new layer of preparation for AI-driven search.
Key takeaways
- Fix crawling and indexing first; nothing else matters if important pages are not indexed.
- Use British English, GBP pricing and a clear UK address or service area so both people and algorithms recognise you as a UK supplier.
- If you run a .uk site alongside an international .com, connect them with hreflang (en-GB and an x-default) to avoid duplicate-content confusion.
- Structured data, consistent organisation details and an llms.txt file help AI systems describe your business accurately.
- Core Web Vitals and mobile usability remain part of a good page experience; measure them with real-user data.
Start with crawlability and indexation
Open Google Search Console and Bing Webmaster Tools before touching anything else. Together they show which pages are indexed, which are excluded and why. Bing matters more than many UK firms assume, because its index also feeds several AI assistants.
Checklist
- Submit an XML sitemap that lists only canonical, indexable URLs that return a 200 status.
- Check robots.txt does not block CSS, JavaScript or important sections, and that it references your sitemap.
- Make sure every page has one self-referencing canonical tag, and that filtered or tracking-parameter URLs point back to the clean version.
- Remove or noindex thin pages such as empty tag archives, internal search results and basket or checkout pages.
- Fix redirect chains so old URLs go to their final destination in a single 301 hop.
Handling JavaScript-heavy sites
Single-page applications built with React, Vue or Angular can be indexed, but only if the content appears in the rendered HTML reliably. Google renders JavaScript in a second pass, which can delay indexing, and some other crawlers do not render it at all. For marketing pages, service pages and articles, prefer server-side rendering or static generation so the main text, headings and links are present in the initial HTML. Use the URL Inspection tool in Search Console to compare what Google sees with what a visitor sees.
Signal clearly that you serve the UK
Search engines use many clues to decide which country a site is relevant to. A .uk or .co.uk domain is a strong signal on its own, but it should be backed up by the content.
| Signal | What good looks like |
|---|---|
| Language and spelling | British English throughout (“optimise”, “organisation”, “colour”) and an en-GB language attribute |
| Currency and tax | Prices in pounds sterling with VAT treatment stated clearly |
| Location | A London office or UK service area shown consistently on the contact page, footer and structured data |
| Local proof | Content about UK regulations, sectors and buyer concerns rather than generic global copy |
| Contact details | A UK email address and, where available, a UK phone number in international format |
Be explicit about VAT. UK business buyers expect to see whether a price includes or excludes VAT, and ambiguity creates friction at exactly the moment someone is deciding whether to get in touch. The same applies to delivery timescales stated in UK working days rather than vague promises.
Google Business Profile for a London office
If you have premises where you meet clients, or a genuine service area, a Google Business Profile can help you appear in local results and Maps. Use the exact business name, choose the most specific category available and keep opening hours accurate. Only list an address where the business genuinely operates; virtual-office addresses used solely to rank are against Google’s guidelines and can lead to suspension.
Running a .uk site next to a global .com
Many groups operate an international site and a UK site with similar services. Without guidance, Google may treat the two as duplicates and show the wrong one to British users. Two things help:
- Genuinely localised content. Adapt pricing, legal references, examples and calls to action for the UK rather than copying pages word for word.
- Reciprocal hreflang annotations. Each UK page declares itself as
en-GB, points to its international equivalent (for exampleen), and both sites agree on anx-default. Annotations must be reciprocal and use absolute URLs, otherwise search engines ignore them.
Hreflang tells search engines which version to show to whom. It does not fix thin or duplicated content, so localise the pages first and annotate them second.
Site speed and Core Web Vitals
Page experience is one of many ranking considerations, and it has a direct effect on enquiries: visitors on a train between stations will not wait for a heavy page. Focus on the three Core Web Vitals and use field data from Search Console or the Chrome UX Report rather than a single lab test.
- Largest Contentful Paint (LCP): serve correctly sized, compressed images, preload the hero image and use a CDN with UK and European edge locations.
- Interaction to Next Paint (INP): reduce heavy JavaScript, defer non-essential scripts and avoid long tasks on the main thread.
- Cumulative Layout Shift (CLS): reserve space for images, embeds and cookie banners so content does not jump.
Self-host fonts and scripts where you can. It removes third-party requests, simplifies your cookie consent obligations under PECR and usually makes pages faster.
Hosting and CDN location
Where your server sits still affects speed for British visitors. A site hosted far away without a content delivery network will feel slower in Leeds or Glasgow than one served from a UK or western European edge. Combine nearby hosting or a CDN with full-page caching for anonymous visitors, HTTP/2 or HTTP/3, and modern image formats such as WebP or AVIF. Check time to first byte from a UK location as part of every release.
Structured data and entity consistency
Structured data in JSON-LD helps search engines and AI systems understand who you are. For a UK office of an international company, describe both entities honestly: the local office and its parent organisation.
Recommended schema types
- Organization (or a more specific type such as ProfessionalService) with name, URL, logo, contact email, address locality and
sameAslinks to official social profiles. - parentOrganization where the UK site is part of a wider group, linking to the main company website.
- Article for blog posts, with author, date published and date modified.
- FAQPage for genuine question-and-answer content, and BreadcrumbList for navigation.
- Product or Service with prices in GBP for packages you sell online.
Keep your company name, address and description identical across the website, Google Business Profile, LinkedIn and directories. Inconsistent details are one of the most common reasons AI answers describe a business incorrectly.
Preparing for AI search and llms.txt
AI assistants draw on web content, search indexes and their own crawlers. You cannot control what they say, but you can make accurate information easy to find.
| Action | Why it helps |
|---|---|
| Allow reputable AI crawlers in robots.txt (for example Googlebot, Google-Extended, GPTBot, ClaudeBot, PerplexityBot) if you want to be cited | Blocked content cannot be summarised or linked |
Publish an /llms.txt file |
A plain-text summary of your organisation and key pages that language-model tools can read quickly; it is an emerging convention, not a ranking factor |
| Write clear, factual “who we are” and service pages | AI answers often quote definitions and short factual paragraphs |
| Answer real customer questions in FAQ sections | Question-shaped content matches how people prompt assistants |
| Keep pages server-rendered and readable without JavaScript | Not every crawler executes scripts |
Treat llms.txt as a helpful extra rather than a guarantee. The fundamentals of crawlable pages, accurate facts and a good reputation still do most of the work.
On-page essentials that are still often missed
- A unique title tag of roughly 50–60 characters and a meta description written to earn the click.
- One clear H1 per page and a logical heading structure underneath it.
- Descriptive alt text for meaningful images, which also supports accessibility under the Equality Act 2010.
- Internal links from strong pages to important service pages using descriptive anchor text.
- Open Graph and social card tags so links shared on LinkedIn and messaging apps display properly.
Our web development team builds these elements into templates, so new pages are SEO-ready by default rather than fixed one by one later.
Measuring progress without vanity metrics
Rankings fluctuate daily, so judge technical SEO by trends over weeks and months:
- Indexed pages versus pages you want indexed.
- Impressions and clicks for non-branded UK queries in Search Console.
- Core Web Vitals pass rate on mobile.
- Enquiries and sales attributed to organic search in GA4, measured with consent in line with UK GDPR and PECR.
A simple monthly routine
- Review the Page indexing report in Search Console and investigate any new exclusions.
- Check Core Web Vitals for mobile and desktop and note any templates that slipped.
- Crawl the site with a tool such as Screaming Frog to catch broken links, redirect chains and missing titles.
- Validate structured data on a sample of pages using the Rich Results Test.
- Search for your brand in Google and in two or three AI assistants, and note any inaccurate descriptions to correct at the source.
Frequently asked questions
Does a .co.uk domain rank better in the UK than a .com?
A country-code domain is a clear signal of UK relevance, but it is not a shortcut to rankings. Content quality, links, local signals and technical health matter far more.
Do we need separate content for our UK and international sites?
Yes, at least for key pages. Localise pricing, legal references and examples, then connect equivalent pages with hreflang so each audience sees the right version.
Will an llms.txt file get us into AI answers?
No file can guarantee that. It is a lightweight way to present accurate facts about your organisation, and it works best alongside crawlable pages and consistent information across the web.
How long does technical SEO take to show results?
Crawl and indexing fixes can show up within weeks. Competitive UK search terms typically need several months of combined technical, content and authority work.
Get a technical SEO review
Creensight UK combines engineering and search expertise, backed by the development team of Creensight Private Limited in India, so fixes are implemented in code rather than left in a report. Explore our digital marketing and SEO services, see the fixed-price SEO package in our shop, or contact us for a review of your site.