fix(detail): label official DfE figures as 'England average' (provenance)

Batch B (points 5-6): the detail page called every national figure a
'National avg'. All of them come from the official-DfE national-averages
marts (KS2/KS4 headlines), so they are England averages — relabel to
match the compare screen's provenance convention ('England average' for
official figures; the detail page has no computed benchmarks, so no
'state-school average (computed)' label is needed). Point 6 (anchoring
every number) is already satisfied on the detail page via DeltaChip.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

nextjs-app/components/SchoolDetailView.tsx

@@ -622,8 +622,8 @@ export function SchoolDetailView({
           </h2>
           <p className={styles.sectionSubtitle}>
             {isSecondary
-              ? 'GCSE results for Year 11 pupils. National averages shown for comparison.'
-              : 'End-of-primary-school tests taken by Year 6 pupils. National averages shown for comparison.'}
+              ? 'GCSE results for Year 11 pupils. England averages shown for comparison.'
+              : 'End-of-primary-school tests taken by Year 6 pupils. England averages shown for comparison.'}
           </p>
 
           {/* ── Primary / KS2 content ── */}
@@ -648,7 +648,7 @@ export function SchoolDetailView({
                       )}
                     </div>
                     {primaryAvg.rwm_expected_pct != null && (
-                      <div className={styles.heroStatHint}>National avg: {primaryAvg.rwm_expected_pct.toFixed(0)}%</div>
+                      <div className={styles.heroStatHint}>England avg: {primaryAvg.rwm_expected_pct.toFixed(0)}%</div>
                     )}
                   </div>
                 )}
@@ -670,7 +670,7 @@ export function SchoolDetailView({
                       )}
                     </div>
                     {primaryAvg.rwm_high_pct != null && (
-                      <div className={styles.heroStatHint}>National avg: {primaryAvg.rwm_high_pct.toFixed(0)}%</div>
+                      <div className={styles.heroStatHint}>England avg: {primaryAvg.rwm_high_pct.toFixed(0)}%</div>
                     )}
                   </div>
                 )}
@@ -776,7 +776,7 @@ export function SchoolDetailView({
                     </div>
                     <div className={styles.metricValue}>{latestResults.attainment_8_score.toFixed(1)}</div>
                     {secondaryAvg.attainment_8_score != null && (
-                      <div className={styles.metricHint}>National avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
+                      <div className={styles.metricHint}>England avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
                     )}
                   </div>
                 )}
@@ -800,7 +800,7 @@ export function SchoolDetailView({
                     </div>
                     <div className={styles.metricValue}>{formatPercentage(latestResults.english_maths_standard_pass_pct)}</div>
                     {secondaryAvg.english_maths_standard_pass_pct != null && (
-                      <div className={styles.metricHint}>National avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
+                      <div className={styles.metricHint}>England avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
                     )}
                   </div>
                 )}
@@ -812,7 +812,7 @@ export function SchoolDetailView({
                     </div>
                     <div className={styles.metricValue}>{formatPercentage(latestResults.english_maths_strong_pass_pct)}</div>
                     {secondaryAvg.english_maths_strong_pass_pct != null && (
-                      <div className={styles.metricHint}>National avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
+                      <div className={styles.metricHint}>England avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
                     )}
                   </div>
                 )}
@@ -968,7 +968,7 @@ export function SchoolDetailView({
                   )}
                 </div>
                 {primaryAvg.eal_pct != null && (
-                  <div className={styles.heroStatHint}>National avg: {primaryAvg.eal_pct.toFixed(0)}%</div>
+                  <div className={styles.heroStatHint}>England avg: {primaryAvg.eal_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}
@@ -985,7 +985,7 @@ export function SchoolDetailView({
                   )}
                 </div>
                 {primaryAvg.sen_support_pct != null && (
-                  <div className={styles.heroStatHint}>National avg: {primaryAvg.sen_support_pct.toFixed(0)}%</div>
+                  <div className={styles.heroStatHint}>England avg: {primaryAvg.sen_support_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}
@@ -1157,7 +1157,7 @@ export function SchoolDetailView({
                 </div>
                 <div className={styles.metricValue}>{formatPercentage(absenceData.overall_absence_rate)}</div>
                 {primaryAvg.overall_absence_pct != null && (
-                  <div className={styles.metricHint}>National avg: ~{primaryAvg.overall_absence_pct.toFixed(1)}%</div>
+                  <div className={styles.metricHint}>England avg: ~{primaryAvg.overall_absence_pct.toFixed(1)}%</div>
                 )}
               </div>
             )}
@@ -1169,7 +1169,7 @@ export function SchoolDetailView({
                 </div>
                 <div className={styles.metricValue}>{formatPercentage(absenceData.persistent_absence_rate)}</div>
                 {primaryAvg.persistent_absence_pct != null && (
-                  <div className={styles.metricHint}>National avg: ~{primaryAvg.persistent_absence_pct.toFixed(0)}%</div>
+                  <div className={styles.metricHint}>England avg: ~{primaryAvg.persistent_absence_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}

nextjs-app/components/SecondarySchoolDetailView.tsx

@@ -463,7 +463,7 @@ export function SecondarySchoolDetailView({
             GCSE Results ({formatAcademicYear(latestResults.year)})
           </h2>
           <p className={styles.sectionSubtitle}>
-            GCSE results for Year 11 pupils. National averages shown for comparison.
+            GCSE results for Year 11 pupils. England averages shown for comparison.
           </p>
 
           {p8Suspended && (
@@ -492,7 +492,7 @@ export function SecondarySchoolDetailView({
                   )}
                 </div>
                 {secondaryAvg.attainment_8_score != null && (
-                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
+                  <div className={styles.heroStatHint}>England avg: {secondaryAvg.attainment_8_score.toFixed(1)}</div>
                 )}
               </div>
             )}
@@ -532,7 +532,7 @@ export function SecondarySchoolDetailView({
                   )}
                 </div>
                 {secondaryAvg.english_maths_strong_pass_pct != null && (
-                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
+                  <div className={styles.heroStatHint}>England avg: {secondaryAvg.english_maths_strong_pass_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}
@@ -554,7 +554,7 @@ export function SecondarySchoolDetailView({
                   )}
                 </div>
                 {secondaryAvg.english_maths_standard_pass_pct != null && (
-                  <div className={styles.heroStatHint}>National avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
+                  <div className={styles.heroStatHint}>England avg: {secondaryAvg.english_maths_standard_pass_pct.toFixed(0)}%</div>
                 )}
               </div>
             )}