diff --git a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_summary.pdf b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_summary.pdf
index 7e17907d9..fe9d91f0f 100644
Binary files a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_summary.pdf and b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_summary.pdf differ
diff --git a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_worksheet.pdf b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_worksheet.pdf
index da423eee1..dcaddc460 100644
Binary files a/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_worksheet.pdf and b/backend/epc_api/json_samples/real_life_examples/RdSAP-Schema-21.0.1/uprn_100061275133/elmhurst_worksheet.pdf differ
diff --git a/scripts/hyde/build_100061275133.py b/scripts/hyde/build_100061275133.py
index c959a44f6..dc0a88d8b 100644
--- a/scripts/hyde/build_100061275133.py
+++ b/scripts/hyde/build_100061275133.py
@@ -75,6 +75,12 @@ def walls(page):
     print("insulation ->", _pick(page, f"{WALL}DropDownListInsulation", "external"))
     print("party ->", _pick(page, f"{PWALL}DropDownListPartyWallType", "determine")
           or _pick(page, f"{PWALL}DropDownListPartyWallType", "masonry"))
+    # wall thickness (cert lodges 400 mm; Elmhurst else defaults 260)
+    for suf in (f"{WALL}TextBoxThickness", f"{WALL}TextBoxWallThickness"):
+        if page.locator(f"#{E.FP}{suf}").count():
+            E.set_text(page, suf, "400"); print("wall thickness set 400 via", suf); break
+    else:
+        print("thickness field not found; wall fields:", [i for i in page.evaluate("()=>Array.from(document.querySelectorAll('[id*=Wall]')).map(e=>e.id)")][:20])
     E.save_close(page)
 
 
@@ -129,8 +135,8 @@ def ventilation(page):
     E.click_tab(page, "TabContainer_TabPanelAirPressureTest")
     E.set_select(page, f"{APT}DropDownListTestMethod", "Not available")
     E.click_tab(page, "TabContainer_TabPanelLighting")
-    E.set_text(page, f"{LP}TextBoxLightsTotal", "6")
-    E.set_text(page, f"{LP}TextBoxLedLightsTotal", "0")
+    E.set_text(page, f"{LP}TextBoxLightsTotal", "5")
+    E.set_text(page, f"{LP}TextBoxLedLightsTotal", "5")
     E.set_text(page, f"{LP}TextBoxCflLightsTotal", "0")
     E.save_close(page)