{
 "metric": "security-headers",
 "segment": "gb-companies",
 "anchor": "company",
 "label": "UK companies",
 "population": "UK companies",
 "states": [
  "strong",
  "partial",
  "missing"
 ],
 "quiet_failure_states": [
  "partial",
  "missing"
 ],
 "measurement": "Tier 3a; check `Strict-Transport-Security`, `Content-Security-Policy`, `X-Frame-Options` on the homepage response. Denominator: `has_web`.",
 "why_it_matters": "HSTS is what stops the first, downgradeable request; CSP is what limits the damage of injected script. Both are one-line changes, and both are commonly switched off silently by a framework upgrade or a proxy change.",
 "limits": null,
 "data_tier": "http_3a",
 "population_predicate": "has_web",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-13",
  "n": 2007,
  "qf_pct": 73.94,
  "ci": [
   71.98,
   75.81
  ],
  "dist": {
   "strong": 26.06,
   "partial": 18.49,
   "missing": 55.46
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 973,
   "qf_pct": 74.41,
   "ci": [
    71.57,
    77.05
   ],
   "dist": {
    "strong": 25.59,
    "partial": 19.84,
    "missing": 54.57
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 1005,
   "qf_pct": 73.03,
   "ci": [
    70.21,
    75.69
   ],
   "dist": {
    "strong": 26.97,
    "partial": 20.3,
    "missing": 52.74
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 2000,
   "qf_pct": 74.35,
   "ci": [
    72.39,
    76.22
   ],
   "dist": {
    "partial": 18.65,
    "missing": 55.7,
    "strong": 25.65
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 2003,
   "qf_pct": 73.79,
   "ci": [
    71.82,
    75.67
   ],
   "dist": {
    "strong": 26.21,
    "partial": 18.57,
    "missing": 55.22
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-06",
   "n": 1998,
   "qf_pct": 73.77,
   "ci": [
    71.8,
    75.66
   ],
   "dist": {
    "strong": 26.23,
    "partial": 18.67,
    "missing": 55.11
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-13",
   "n": 2007,
   "qf_pct": 73.94,
   "ci": [
    71.98,
    75.81
   ],
   "dist": {
    "strong": 26.06,
    "partial": 18.49,
    "missing": 55.46
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/security-headers/gb-companies"
}