diff --git a/www/www.vcl.tftpl b/www/www.vcl.tftpl
index e97f8af..46d398f 100644
--- a/www/www.vcl.tftpl
+++ b/www/www.vcl.tftpl
@@ -230,7 +230,7 @@ sub vcl_recv {
   if (req.method !~ "^(GET|HEAD|POST|PUT|DELETE|OPTIONS|PATCH|FASTLYPURGE)") {
     error 806 "Not Implemented";
   }
-  
+
   %{ if private_extra_vcl_recv != "" ~}
     ${private_extra_vcl_recv}
   %{ endif ~}
@@ -676,6 +676,10 @@ sub vcl_error {
     }
   }
 
+  if (beresp.http.Govuk-Rendered-Error) {
+    return (deliver);
+  }
+
   # Assume we've hit vcl_error() because the backend is unavailable
   # for the first two retries. By restarting, vcl_recv() will try
   # serving from stale before failing over to the mirrors.