diff --git a/app/main/views/notifications.py b/app/main/views/notifications.py
index 9ec77aeb8..f1e594357 100644
--- a/app/main/views/notifications.py
+++ b/app/main/views/notifications.py
@@ -90,7 +90,10 @@ def view_notification(service_id, notification_id):
         created_by=notification.get('created_by'),
         created_at=notification['created_at'],
         help=get_help_argument(),
-        estimated_letter_delivery_date=get_letter_timings(notification['created_at']).earliest_delivery,
+        estimated_letter_delivery_date=get_letter_timings(
+            notification['created_at'],
+            postage=notification['postage']
+        ).earliest_delivery,
         notification_id=notification['id'],
         postage=notification['postage'],
         can_receive_inbound=(current_service.has_permission('inbound_sms')),
diff --git a/tests/app/main/views/test_notifications.py b/tests/app/main/views/test_notifications.py
index 3c53ebf9f..5a6bdd418 100644
--- a/tests/app/main/views/test_notifications.py
+++ b/tests/app/main/views/test_notifications.py
@@ -141,7 +141,7 @@ def test_notification_page_shows_page_for_letter_notification(
 
     count_of_pages = 3
 
-    mock_get_notification(mocker, fake_uuid, template_type='letter')
+    mock_get_notification(mocker, fake_uuid, template_type='letter', postage='second')
     mocker.patch(
         'app.main.views.notifications.get_page_count_for_letter',
         return_value=count_of_pages
@@ -174,6 +174,25 @@ def test_notification_page_shows_page_for_letter_notification(
         )
 
 
+@freeze_time("2016-01-01 01:01")
+def test_notification_page_shows_page_for_first_class_letter_notification(
+    client_request,
+    mocker,
+    fake_uuid,
+):
+    mock_get_notification(mocker, fake_uuid, template_type='letter', postage='first')
+    mocker.patch('app.main.views.notifications.get_page_count_for_letter', return_value=3)
+
+    page = client_request.get(
+        'main.view_notification',
+        service_id=SERVICE_ONE_ID,
+        notification_id=fake_uuid,
+    )
+
+    assert normalize_spaces(page.select('main p:nth-of-type(2)')[0].text) == 'Postage: first class'
+    assert normalize_spaces(page.select('main p:nth-of-type(3)')[0].text) == 'Estimated delivery date: 5 January'
+
+
 @pytest.mark.parametrize('filetype', [
     'pdf', 'png'
 ])
diff --git a/tests/conftest.py b/tests/conftest.py
index c00bfd387..66cd2ccce 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2645,6 +2645,7 @@ def mock_get_notification(
     template_name='sample template',
     is_precompiled_letter=False,
     key_type=None,
+    postage=None
 ):
     def _get_notification(
         service_id,
@@ -2655,6 +2656,7 @@ def mock_get_notification(
             rows=1,
             status=notification_status,
             template_type=template_type,
+            postage=postage
         )['notifications'][0]
 
         noti['id'] = notification_id