Most poor rankings are not caused by weak content alone. They're caused by technical issues that prevent Google from properly crawling, rendering, indexing, or ranking your site: broken signals, crawl errors, slow load times, structural problems.
This checklist covers the technical SEO areas that matter most for UK businesses in 2026, organised by priority. There are 18 High priority checks, 24 Medium priority, and 14 Lower priority items. Work them in order.
Tools You Will Need
Most of these have generous free tiers — you don't need an expensive stack to run a serious technical audit.
- Google Search Console
- Google Analytics 4
- PageSpeed Insights
- Screaming Frog SEO Spider
- Ahrefs or Semrush
- Google Rich Results Test
- Chrome DevTools
1. Crawlability & Indexation
High Priority
- Google Search Console setup and verification
- Coverage report review (Excluded, Error, Warning pages)
- XML sitemap submission (200 status)
- robots.txt accessibility and configuration
- No accidental noindex tags on live pages
- Preferred domain (www/non-www) with correct redirects
Medium Priority
- No redirect chains
- Broken links (4xx errors) fixed
- No duplicate content
- Correct canonical tag implementation
- Crawl budget verification
- Pagination handling
Lower Priority
- Pagination with canonical tags
“The most common crawlability issue on London business websites is accidental noindex tags left active after a site migration or WordPress staging setup — silently preventing Google from indexing live pages.”
2. Core Web Vitals & Page Speed
2026 thresholds — these are the numbers Google uses for ranking:
- LCP (Largest Contentful Paint): Good <2.5s · Needs Improvement 2.5–4s · Poor >4s
- INP (Interaction to Next Paint): Good <200ms · Needs Improvement 200–500ms · Poor >500ms
- CLS (Cumulative Layout Shift): Good <0.1 · Needs Improvement 0.1–0.25 · Poor >0.25
High Priority
- PageSpeed Insights testing (homepage, service pages, blog posts)
- Search Console Core Web Vitals report review
- LCP element optimisation
- fetchpriority="high" on LCP images with preloading
- Image compression and WebP/AVIF format serving
- Server-side caching implementation
Medium Priority
- CLS fixes with explicit dimensions
- Deferring non-critical JavaScript/CSS
- CDN for static assets
- Third-party script minimisation
- TTFB under 800ms from UK servers
Lower Priority
- HTTP/2 or HTTP/3 enablement
3. Mobile Experience
High Priority
- Google Mobile-Friendly Test pass
- Search Console Mobile Usability report (no issues)
- Viewport meta tag configuration
Medium Priority
- Tap targets minimum 48×48px
- Body text minimum 16px (readable without zoom)
- Forms and CTAs tested on mobile
- No horizontal scrolling
Lower Priority
- Image scaling on small screens
4. On-Page Technical Signals
High Priority
- Unique title tags (50–60 characters)
- Unique meta descriptions (150–160 characters)
- Single H1 tag per page with primary keyword
Medium Priority
- Logical heading hierarchy (H1 → H2 → H3)
- Descriptive alt text on all images
- Short, descriptive URLs (hyphens, not underscores)
- No keyword stuffing
- No thin content (minimum 300 words with clear purpose)
Lower Priority
- Open Graph and Twitter Card tags
5. Structured Data & Schema Markup
High Priority
- Organisation or LocalBusiness schema on homepage
- All data validated in Rich Results Test (no errors)
- Search Console Enhancements review
Medium Priority
- BreadcrumbList schema on inner pages
- Article/BlogPosting schema on blog posts
- FAQPage schema on FAQ sections
- Service schema on service pages
6. Local SEO & Google Business Profile
High Priority
- Google Business Profile claimed, verified, completed
- NAP consistency (name, address, phone) across all channels
- Minimum 5 reviews with active solicitation
- Primary category set correctly
- LocalBusiness schema matching GBP information
Medium Priority
- Listings in Yell, Bing Places, Apple Maps
- Monthly GBP posts
- Q&A section populated
Lower Priority
- Service area pages for locations served
7. HTTPS & Security Signals
High Priority
- Full HTTPS serving with valid SSL certificate
- HTTP to HTTPS 301 redirects
- No mixed content warnings
- Non-expired certificate with auto-renewal
- Search Console Security Issues review
Medium Priority
- Security headers configured (HSTS, X-Frame-Options, CSP)
- WordPress and plugins kept current
8. Internal Links & Site Architecture
High Priority
- Key pages linked from main navigation
Medium Priority
- Blog posts linking to service pages with keyword-rich anchor text
- No orphan pages
- Descriptive anchor text
- No broken internal links
- Key pages within 3 clicks from homepage
Lower Priority
- Breadcrumb navigation
- Related posts links
9. Analytics & Tracking Verification
High Priority
- GA4 correctly installed and tracking all pages
- Google Search Console linked to GA4
- Key conversions tracked as GA4 events
Medium Priority
- No double-tracking
- Bing Webmaster Tools setup
Lower Priority
- 404 error page tracking
What to Fix First: A Prioritised Action Plan
Week 1 — Critical Blocking Issues
Address crawlability/indexation problems: noindex tags, robots.txt blocking, broken sitemaps, missing HTTPS. None of the rest matters if Google can't crawl your site.
Week 2–3 — Core Web Vitals
Work in impact order: LCP (image optimisation, caching), CLS (dimensions, stability), INP (JavaScript performance).
Week 4 — On-Page Signals and Structured Data
Update title tags and meta descriptions on high-traffic pages. Implement LocalBusiness and Service schema.
Ongoing — Local SEO and Content
Treat GBP optimisation, directory citations, and review generation as monthly activities — not one-off tasks.
“Most London businesses that come to us for SEO help have the same three issues: slow Core Web Vitals on mobile, missing structured data, and an under-optimised Google Business Profile.”
Want Specifek to Run This Audit?
We deliver this exact audit as a deliverable — full report with prioritised findings and remediation guidance, tailored to your tech stack.
Key Takeaways
- Technical SEO is foundational — crawlability must precede content and link-building work.
- Core Web Vitals (LCP, INP, CLS) are confirmed 2026 ranking factors with significant optimisation room.
- Mobile-first indexing determines rankings, not desktop performance.
- Google Business Profile and LocalBusiness schema offer the highest-impact local SEO activities.
- Structured data enables rich results and page comprehension.
- Fix in priority order: crawl issues → Core Web Vitals → on-page signals → structured data / local SEO.