Website readiness profile · Snapshot 23 October 2026
nationaltrust.org.uk
nationaltrust.org.uk's public homepage, certificate and DNS checked against 31 practices and compared with 343 Uncategorized sites.
- Readiness index
- 73/100
- Ahead of
- 77%
- Practices observed
- 20/31
- Popularity band
- Top 50K
Uncategorized median 62
of measured Uncategorized sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: nationaltrust.org.uk. Thin bar: Uncategorized peer median.
Enable
87/100
Peers 80
Harden
63/100
Peers 54
Accelerate
78/100
Peers 58
Recover
0/100
Peers 12
Priority fixes for nationaltrust.org.uk
Ordered by impact and by how common each practice is among peers.
Priority 1 · Harden
DMARC policy enforces quarantine or reject
Observed: The DMARC policy for nationaltrust.org.uk was p=none, which asks receivers to take no action on failing mail.
Why it matters: An enforcing DMARC policy helps receiving mail systems reject email that falsely claims to come from your domain, a common route for phishing your customers.
What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.
39% of Uncategorized peers do this. Limit: Read from public DNS at the time of the check; records may have changed since.
Priority 2 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 1 external script without async or defer.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
On Next.js: Use the next/script component with an appropriate loading strategy.
37% of Uncategorized peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 3 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from GlobalSign nv-sa had a 389-day validity period, longer than the 100-day maximum that applies from March 2027.
What to do: Move to automated issuance and renewal now, while you still have time to test it.
67% of Uncategorized peers do this.
Priority 4 · Accelerate
HTTP/3 advertised
Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.
What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.
33% of Uncategorized peers do this.
What nationaltrust.org.uk already does well
Practices fewer than half of Uncategorized peers use.
- Referrer-Policy setReferrer-Policy present.23% of peers
- Modern image formats in useWebP or AVIF images detected.33% of peers
- HSTS kept for at least a yearHSTS with a 365-day max-age covering subdomains.34% of peers
What we saw
- Homepage checked
- https://www.nationaltrust.org.uk/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- GlobalSign, 389-day validity, expiring 2026-11-22
- Platform or framework
- Next.js
- DNS operators
- 1 self-run or other nameserver domain
- HSTS
- max-age 365 days, includeSubDomains
- DMARC policy
- p=none
- Homepage HTML
- 618 KB, gzip
- Images on homepage
- 21 (jpg 260, webp 13)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 11
- Certificate lifetime of 100 days or less
- CAA records limit who can issue certificates
- DNSSEC signed
- security.txt published
- DMARC policy enforces quarantine or reject
- Content Security Policy present
- HTTP/3 advertised
- No render-blocking scripts in <head>
- Reachable over IPv6
- Structured data present
- Nameservers spread across providers
Observed 20
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- X-Content-Type-Options: nosniff
- Framing restricted
- Referrer-Policy set
- HTTP/2 negotiated
- HTML compressed
- Static files cached for 30 days or more
- Modern image formats in use
- Offscreen images lazy-loaded
- robots.txt published
- XML sitemap discoverable
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Own nationaltrust.org.uk?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: nationaltrust.org.uk. This profile covers configuration only.