diff --git a/e2e/tests/journeys.spec.ts b/e2e/tests/journeys.spec.ts
index 29aa4e3..80178a6 100644
--- a/e2e/tests/journeys.spec.ts
+++ b/e2e/tests/journeys.spec.ts
@@ -148,6 +148,24 @@ test('school detail page shows GIAS identity/contact details and drops the unwir
   }
 });
 
+test('header details collapse behind a "Show all details" toggle on mobile', async ({ page }) => {
+  await page.setViewportSize({ width: 390, height: 844 });
+  const [urn] = await twoPrimaryUrns(page);
+  await page.goto(`/school/${urn}`);
+  await expect(page.locator('h1').first()).toBeVisible({ timeout: 15_000 });
+
+  // Collapsed by default on mobile/tablet …
+  const details = page.locator('#school-header-details');
+  await expect(details).toBeHidden();
+  const toggle = page.getByRole('button', { name: /show all details/i });
+  await expect(toggle).toBeVisible();
+
+  // … and the link reveals them (label flips to "Hide details").
+  await toggle.click();
+  await expect(details).toBeVisible();
+  await expect(page.getByRole('button', { name: /hide details/i })).toBeVisible();
+});
+
 test('a report-card school shows its report card, dated to the report-card inspection', async ({ page }) => {
   // Detail views detected report cards via `framework`, which the API never
   // sets to "ReportCard" — so report-card schools rendered as legacy ratings
diff --git a/nextjs-app/components/SchoolDetailView.module.css b/nextjs-app/components/SchoolDetailView.module.css
index 0ea36c2..5286103 100644
--- a/nextjs-app/components/SchoolDetailView.module.css
+++ b/nextjs-app/components/SchoolDetailView.module.css
@@ -197,6 +197,22 @@
     text-decoration: underline;
 }
 
+/* "Show all details" reveal — only rendered on mobile/tablet, where the
+   header details block is collapsed below the fold. Hidden on desktop. */
+.detailsToggle {
+    display: none;
+    align-items: center;
+    gap: 0.25rem;
+    margin-top: 0.5rem;
+    padding: 0;
+    background: none;
+    border: none;
+    font-size: 0.8125rem;
+    font-weight: 600;
+    color: var(--accent-teal, #2d7d7d);
+    cursor: pointer;
+}
+
 /* Gender split card — sits in the Pupils & Inclusion heroStatGrid */
 .genderSplitValue {
     display: flex;
@@ -1205,14 +1221,24 @@
         gap: 0.375rem;
     }
 
-    /* Secondary header info (headteacher, website, pupil count, trust)
-       isn't needed above the fold on phones — pupil count lives in the
-       Pupils & Inclusion section, website is one scroll away. Reclaim
-       the ~3 vertical lines so the actual metrics surface sooner. */
+    /* Secondary header info (headteacher, website, pupil count, trust,
+       contact, area) isn't needed above the fold on phones/tablets, so it's
+       collapsed by default and revealed on demand via the "Show all details"
+       link — reclaiming the vertical space so the metrics surface sooner. */
+    .detailsToggle {
+        display: inline-flex;
+    }
+
     .headerDetails {
         display: none;
     }
 
+    .headerDetailsOpen {
+        display: flex;
+        flex-direction: column;
+        gap: 0.375rem;
+    }
+
     .metricsGrid {
         grid-template-columns: repeat(2, 1fr);
     }
diff --git a/nextjs-app/components/SchoolDetailView.tsx b/nextjs-app/components/SchoolDetailView.tsx
index adca63c..3a14cc7 100644
--- a/nextjs-app/components/SchoolDetailView.tsx
+++ b/nextjs-app/components/SchoolDetailView.tsx
@@ -99,6 +99,9 @@ export function SchoolDetailView({
   const heroMapRef = useRef<SchoolHeroMapHandle>(null);
   // "All ▾" jump menu listing every section.
   const [sectionsOpen, setSectionsOpen] = useState(false);
+  // Header details (headteacher, contact, trust, area) collapse behind a
+  // "Show all details" link on mobile/tablet, where they're below the fold.
+  const [detailsOpen, setDetailsOpen] = useState(false);
 
   // Back returns to wherever the user came from; deep-links (no in-app history)
   // fall back to search so the button never dead-ends or leaves the site.
@@ -354,13 +357,6 @@ export function SchoolDetailView({
               {schoolInfo.age_range && (
                 <span className={styles.metaItem}>{formatAgeRange(schoolInfo.age_range)}</span>
               )}
-              {schoolInfo.religious_denomination && (
-                <span className={styles.metaItem}>
-                  {['Does not apply', 'None'].includes(schoolInfo.religious_denomination)
-                    ? 'None'
-                    : schoolInfo.religious_denomination}
-                </span>
-              )}
               {schoolInfo.nursery_provision && (
                 <span className={styles.metaItem}>Nursery</span>
               )}
@@ -391,7 +387,20 @@ export function SchoolDetailView({
                 )}
               </p>
             )}
-            <div className={styles.headerDetails}>
+            <button
+              type="button"
+              className={styles.detailsToggle}
+              aria-expanded={detailsOpen}
+              aria-controls="school-header-details"
+              onClick={() => setDetailsOpen((o) => !o)}
+            >
+              {detailsOpen ? 'Hide details' : 'Show all details'}
+              <span aria-hidden="true">{detailsOpen ? '▴' : '▾'}</span>
+            </button>
+            <div
+              id="school-header-details"
+              className={`${styles.headerDetails}${detailsOpen ? ` ${styles.headerDetailsOpen}` : ''}`}
+            >
               {schoolInfo.headteacher_name && (
                 <span className={styles.headerDetail}>
                   <strong>Headteacher:</strong> {schoolInfo.headteacher_name}
@@ -433,6 +442,14 @@ export function SchoolDetailView({
                   </a>
                 </span>
               )}
+              {schoolInfo.religious_denomination && (
+                <span className={styles.headerDetail}>
+                  <strong>Religious character:</strong>{' '}
+                  {['Does not apply', 'None'].includes(schoolInfo.religious_denomination)
+                    ? 'None'
+                    : schoolInfo.religious_denomination}
+                </span>
+              )}
               {schoolInfo.county && (
                 <span className={styles.headerDetail}>
                   <strong>County:</strong> {schoolInfo.county}
diff --git a/nextjs-app/components/SecondarySchoolDetailView.module.css b/nextjs-app/components/SecondarySchoolDetailView.module.css
index a4f02e0..cf57443 100644
--- a/nextjs-app/components/SecondarySchoolDetailView.module.css
+++ b/nextjs-app/components/SecondarySchoolDetailView.module.css
@@ -207,6 +207,22 @@
     text-decoration: underline;
 }
 
+/* "Show all details" reveal — only rendered on mobile/tablet, where the
+   header details block is collapsed below the fold. Hidden on desktop. */
+.detailsToggle {
+    display: none;
+    align-items: center;
+    gap: 0.25rem;
+    margin-top: 0.5rem;
+    padding: 0;
+    background: none;
+    border: none;
+    font-size: 0.8125rem;
+    font-weight: 600;
+    color: var(--accent-teal, #2d7d7d);
+    cursor: pointer;
+}
+
 .actions {
     display: flex;
     gap: 0.5rem;
@@ -1066,7 +1082,18 @@
         padding: 0.1rem 0.375rem;
     }
 
+    /* Collapsed below the fold on phones/tablets; revealed via "Show all
+       details" so the metrics surface sooner. */
+    .detailsToggle {
+        display: inline-flex;
+    }
+
     .headerDetails {
+        display: none;
+    }
+
+    .headerDetailsOpen {
+        display: flex;
         flex-direction: column;
         gap: 0.375rem;
     }
diff --git a/nextjs-app/components/SecondarySchoolDetailView.tsx b/nextjs-app/components/SecondarySchoolDetailView.tsx
index 1304a36..dedd252 100644
--- a/nextjs-app/components/SecondarySchoolDetailView.tsx
+++ b/nextjs-app/components/SecondarySchoolDetailView.tsx
@@ -83,6 +83,8 @@ export function SecondarySchoolDetailView({
   const isInComparison = isSelected(schoolInfo.urn);
 
   const [activeSection, setActiveSection] = useState<string>('');
+  // Header details collapse behind a "Show all details" link on mobile/tablet.
+  const [detailsOpen, setDetailsOpen] = useState(false);
 
   const latestResults = yearlyData.length > 0 ? yearlyData[yearlyData.length - 1] : null;
 
@@ -246,13 +248,6 @@ export function SecondarySchoolDetailView({
               {schoolInfo.age_range && (
                 <span className={styles.badge}>{formatAgeRange(schoolInfo.age_range)}</span>
               )}
-              {schoolInfo.religious_denomination && (
-                <span className={styles.badge}>
-                  {['Does not apply', 'None'].includes(schoolInfo.religious_denomination)
-                    ? 'None'
-                    : schoolInfo.religious_denomination}
-                </span>
-              )}
               {schoolInfo.nursery_provision && (
                 <span className={styles.badge}>Nursery</span>
               )}
@@ -288,7 +283,20 @@ export function SecondarySchoolDetailView({
                 )}
               </p>
             )}
-            <div className={styles.headerDetails}>
+            <button
+              type="button"
+              className={styles.detailsToggle}
+              aria-expanded={detailsOpen}
+              aria-controls="school-header-details"
+              onClick={() => setDetailsOpen((o) => !o)}
+            >
+              {detailsOpen ? 'Hide details' : 'Show all details'}
+              <span aria-hidden="true">{detailsOpen ? '▴' : '▾'}</span>
+            </button>
+            <div
+              id="school-header-details"
+              className={`${styles.headerDetails}${detailsOpen ? ` ${styles.headerDetailsOpen}` : ''}`}
+            >
               {schoolInfo.headteacher_name && (
                 <span className={styles.headerDetail}>
                   <strong>Headteacher:</strong> {schoolInfo.headteacher_name}
@@ -326,6 +334,14 @@ export function SecondarySchoolDetailView({
                   </a>
                 </span>
               )}
+              {schoolInfo.religious_denomination && (
+                <span className={styles.headerDetail}>
+                  <strong>Religious character:</strong>{' '}
+                  {['Does not apply', 'None'].includes(schoolInfo.religious_denomination)
+                    ? 'None'
+                    : schoolInfo.religious_denomination}
+                </span>
+              )}
               {schoolInfo.county && (
                 <span className={styles.headerDetail}>
                   <strong>County:</strong> {schoolInfo.county}