diff --git a/t/cobrand/northumberland.t b/t/cobrand/northumberland.t
index bd6072d359a..73dec222878 100644
--- a/t/cobrand/northumberland.t
+++ b/t/cobrand/northumberland.t
@@ -1,3 +1,4 @@
+use CGI::Simple;
 use FixMyStreet::TestMech;
 use FixMyStreet::Script::CSVExport;
 use Test::MockModule;
@@ -115,6 +116,8 @@ FixMyStreet::override_config {
     ALLOWED_COBRANDS => [ 'northumberland', 'fixmystreet' ],
     MAPIT_URL => 'http://mapit.uk/',
 }, sub {
+    my $o = Open311->new( fixmystreet_body => $body );
+
     my $superuser = $mech->create_user_ok(
         'superuser@example.com',
         name         => 'Super User',
@@ -142,6 +145,15 @@ FixMyStreet::override_config {
                 is_superuser     => 1,
             }, 'Comment created for user assignment';
 
+            my $id = $o->post_service_request_update($comment);
+            my $cgi = CGI::Simple->new($o->test_req_used->content);
+            is $cgi->param('attribute[assigned_to_user_email]'),
+                $superuser->email,
+                'correct assigned_to_user_email attribute';
+            is $cgi->param('attribute[extra_details]'),
+                '',
+                'correct extra_details attribute';
+
             $mech->get_ok( '/report/' . $problem_to_update->id );
             $mech->click_ok('.btn--shortlisted');
             $comment
@@ -150,6 +162,15 @@ FixMyStreet::override_config {
                 shortlisted_user => undef,
                 is_superuser     => 1,
             }, 'Comment created for user un-assignment';
+
+            $id = $o->post_service_request_update($comment);
+            $cgi = CGI::Simple->new($o->test_req_used->content);
+            is $cgi->param('attribute[assigned_to_user_email]'),
+                '',
+                'correct assigned_to_user_email attribute';
+            is $cgi->param('attribute[extra_details]'),
+                '',
+                'correct extra_details attribute';
         };
 
         subtest "Extra details on $host site" => sub {
@@ -158,7 +179,7 @@ FixMyStreet::override_config {
                 button  => 'save',
                 form_id => 'report_inspect_form',
                 fields  => {
-                    detailed_information => 'A',
+                    detailed_information => 'ABC',
                     include_update       => 0,
                 },
             );
@@ -169,6 +190,15 @@ FixMyStreet::override_config {
                 is_superuser         => 1,
             }, 'Comment created for extra details';
 
+            my $id = $o->post_service_request_update($comment);
+            my $cgi = CGI::Simple->new($o->test_req_used->content);
+            is $cgi->param('attribute[assigned_to_user_email]'),
+                '',
+                'correct assigned_to_user_email attribute';
+            is $cgi->param('attribute[extra_details]'),
+                'ABC',
+                'correct extra_details attribute';
+
             $mech->get_ok( '/report/' . $problem_to_update->id );
             $mech->submit_form(
                 button  => 'save',
@@ -187,6 +217,15 @@ FixMyStreet::override_config {
             is_deeply $problem_to_update->get_extra_metadata,
                 {},
                 'Extra details unset on problem';
+
+            $id = $o->post_service_request_update($comment);
+            $cgi = CGI::Simple->new($o->test_req_used->content);
+            is $cgi->param('attribute[assigned_to_user_email]'),
+                '',
+                'correct assigned_to_user_email attribute';
+            is $cgi->param('attribute[extra_details]'),
+                '',
+                'correct extra_details attribute';
         };
     }
 };