{
 "metric": "security-headers",
 "segment": "gb-small",
 "anchor": "company",
 "label": "UK small companies",
 "population": "UK small 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": 750,
  "qf_pct": 75.2,
  "ci": [
   71.99,
   78.16
  ],
  "dist": {
   "strong": 24.8,
   "partial": 16.93,
   "missing": 58.27
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 344,
   "qf_pct": 72.67,
   "ci": [
    67.73,
    77.11
   ],
   "dist": {
    "strong": 27.33,
    "partial": 18.02,
    "missing": 54.65
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 352,
   "qf_pct": 71.59,
   "ci": [
    66.67,
    76.05
   ],
   "dist": {
    "partial": 18.47,
    "strong": 28.41,
    "missing": 53.12
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 742,
   "qf_pct": 75.2,
   "ci": [
    71.97,
    78.17
   ],
   "dist": {
    "strong": 24.8,
    "partial": 17.25,
    "missing": 57.95
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 746,
   "qf_pct": 75.2,
   "ci": [
    71.98,
    78.17
   ],
   "dist": {
    "strong": 24.8,
    "partial": 17.29,
    "missing": 57.91
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-06",
   "n": 745,
   "qf_pct": 75.03,
   "ci": [
    71.8,
    78.01
   ],
   "dist": {
    "strong": 24.97,
    "partial": 17.32,
    "missing": 57.72
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-13",
   "n": 750,
   "qf_pct": 75.2,
   "ci": [
    71.99,
    78.16
   ],
   "dist": {
    "strong": 24.8,
    "partial": 16.93,
    "missing": 58.27
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/security-headers/gb-small"
}