fix(search): no LA comparison for independent schools (H2)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nextjs-app/components/SecondarySchoolRow.tsx

@@ -11,7 +11,7 @@
 'use client';
 
 import type { School } from '@/lib/types';
-import { buildOfstedListBadge, getPhaseStyle, schoolUrl, formatAgeRange, isProposedToClose, isSpecialSchool } from '@/lib/utils';
+import { buildOfstedListBadge, getPhaseStyle, schoolUrl, formatAgeRange, isProposedToClose, isSpecialSchool, isIndependentSchool } from '@/lib/utils';
 import { schoolFlags, schoolTypeLabel } from '@/lib/schoolFacts';
 import styles from './SecondarySchoolRow.module.css';
 
@@ -45,10 +45,12 @@ export function SecondarySchoolRow({
   const att8 = school.attainment_8_score;
   // The school's own Attainment 8 is a same-school figure — shown whenever it
   // exists (special schools included; their type tag on line 2 gives context).
-  // Only the vs-LA-average delta, a benchmark comparison, is dropped for
-  // special schools / PRUs / AP, whose pupils aren't measured against it fairly.
+  // Only the vs-LA-average delta, a benchmark comparison, is dropped: for
+  // special schools / PRUs / AP, whose pupils aren't measured against it
+  // fairly, and for independent schools, because DfE's LA average covers
+  // state-funded schools and an independent's Attainment 8 leaves out IGCSEs.
   const laDelta =
-    att8 != null && !isSpecialSchool(school) && laAvgAttainment8 != null
+    att8 != null && !isSpecialSchool(school) && !isIndependentSchool(school) && laAvgAttainment8 != null
       ? att8 - laAvgAttainment8
       : null;