Website readiness profile · Snapshot 23 October 2026
britishgas.co.uk
britishgas.co.uk's public homepage, certificate and DNS checked against 31 practices and compared with 132 Energy, Electricity & Gas sites.
- Readiness index
- 71/100
- Ahead of
- 63%
- Practices observed
- 18/28
- Popularity band
- Top 10K
Energy, Electricity & Gas median 64
of measured Energy, Electricity & Gas sites
3 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: britishgas.co.uk. Thin bar: Energy, Electricity & Gas peer median.
Enable
95/100
Peers 74
Harden
64/100
Peers 65
Accelerate
50/100
Peers 51
Recover
100/100
Peers 17
Priority fixes for britishgas.co.uk
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for 1 days, short of the 30-day benchmark.
Why it matters: Returning visitors and later page views reuse cached files instead of downloading them again.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
41% of Energy, Electricity & Gas peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Harden
Content Security Policy present
Observed: The homepage response did not include a Content-Security-Policy header.
What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.
50% of Energy, Electricity & Gas peers do this.
Guide: Payment Security and PCI DSS: What Website Owners Need to Know
Priority 3 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 4 external scripts 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.
30% of Energy, Electricity & Gas peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
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.
On Amazon CloudFront: Select HTTP/3 in the distribution's supported HTTP versions.
20% of Energy, Electricity & Gas peers do this.
What britishgas.co.uk already does well
Practices fewer than half of Energy, Electricity & Gas peers use.
- Nameservers spread across providersNameservers spread across more than one operator.17% of peers
- Structured data presentJSON-LD structured data found.36% of peers
- Social preview image setog:image present.47% of peers
What we saw
- Homepage checked
- https://www.britishgas.co.uk/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- DigiCert, 198-day validity, expiring 2027-04-28
- CDN or edge
- Amazon CloudFront
- Platform or framework
- Adobe Experience Manager
- DNS operators
- 4 self-run or other nameserver domains
- HSTS
- max-age 365 days
- DMARC policy
- p=reject
- Homepage HTML
- 83 KB, gzip
- Images on homepage
- 0
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 10
Observed 18
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- HTTP/2 negotiated
- HTML compressed
- robots.txt published
- XML sitemap discoverable
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
- Nameservers spread across providers
Not measured 3
- HTTP requests move to HTTPS
- Modern image formats in use
- Offscreen images lazy-loaded
Own britishgas.co.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: britishgas.co.uk. This profile covers configuration only.