diff --git a/app/main/views/index.py b/app/main/views/index.py
index 951244352..8eb1b6584 100644
--- a/app/main/views/index.py
+++ b/app/main/views/index.py
@@ -200,7 +200,7 @@ def letter_template():
         filename = 'no-branding'
 
     template = {'subject': '', 'content': ''}
-    image_url = url_for('main.letter_branding_preview_image', filename=filename)
+    image_url = url_for('no_cookie.letter_branding_preview_image', filename=filename)
 
     template_image = str(LetterImageTemplate(
         template,
diff --git a/app/main/views/send.py b/app/main/views/send.py
index c3c208cf5..30a351f22 100644
--- a/app/main/views/send.py
+++ b/app/main/views/send.py
@@ -34,7 +34,7 @@ from app import (
     notification_api_client,
     service_api_client,
 )
-from app.main import main
+from app.main import main, no_cookie
 from app.main.forms import (
     ChooseTimeForm,
     CsvUploadForm,
@@ -135,7 +135,7 @@ def send_messages(service_id, template_id):
         current_service,
         show_recipient=True,
         letter_preview_url=url_for(
-            '.view_letter_template_preview',
+            'no_cookie.view_letter_template_preview',
             service_id=service_id,
             template_id=template_id,
             filetype='png',
@@ -364,7 +364,7 @@ def send_test_step(service_id, template_id, step_index):
         current_service,
         show_recipient=True,
         letter_preview_url=url_for(
-            '.send_test_preview',
+            'no_cookie.send_test_preview',
             service_id=service_id,
             template_id=template_id,
             filetype='png',
@@ -465,7 +465,7 @@ def send_test_step(service_id, template_id, step_index):
     )
 
 
-@main.route("/services/<uuid:service_id>/send/<uuid:template_id>/test.<filetype>", methods=['GET'])
+@no_cookie.route("/services/<uuid:service_id>/send/<uuid:template_id>/test.<filetype>", methods=['GET'])
 @user_has_permissions('send_messages')
 def send_test_preview(service_id, template_id, filetype):
 
@@ -478,7 +478,7 @@ def send_test_preview(service_id, template_id, filetype):
         db_template,
         current_service,
         letter_preview_url=url_for(
-            '.send_test_preview',
+            'no_cookie.send_test_preview',
             service_id=service_id,
             template_id=template_id,
             filetype='png',
@@ -502,7 +502,7 @@ def _check_messages(service_id, template_id, upload_id, preview_row, letters_as_
         # errors when we try and unpack in the check_messages route.
         # Rasing a werkzeug.routing redirect means that doesn't happen.
         raise PermanentRedirect(url_for(
-            '.send_messages',
+            'main.send_messages',
             service_id=service_id,
             template_id=template_id
         ))
@@ -529,7 +529,7 @@ def _check_messages(service_id, template_id, upload_id, preview_row, letters_as_
         current_service,
         show_recipient=True,
         letter_preview_url=url_for(
-            '.check_messages_preview',
+            'no_cookie.check_messages_preview',
             service_id=service_id,
             template_id=template_id,
             upload_id=upload_id,
@@ -556,10 +556,10 @@ def _check_messages(service_id, template_id, upload_id, preview_row, letters_as_
 
     if request.args.get('from_test'):
         # only happens if generating a letter preview test
-        back_link = url_for('.send_test', service_id=service_id, template_id=template.id)
+        back_link = url_for('main.send_test', service_id=service_id, template_id=template.id)
         choose_time_form = None
     else:
-        back_link = url_for('.send_messages', service_id=service_id, template_id=template.id)
+        back_link = url_for('main.send_messages', service_id=service_id, template_id=template.id)
         choose_time_form = ChooseTimeForm()
 
     if preview_row < 2:
@@ -650,11 +650,11 @@ def check_messages(service_id, template_id, upload_id, row_index=2):
     return render_template('views/check/ok.html', **data)
 
 
-@main.route(
+@no_cookie.route(
     "/services/<uuid:service_id>/<uuid:template_id>/check/<uuid:upload_id>.<filetype>",
     methods=['GET'],
 )
-@main.route(
+@no_cookie.route(
     "/services/<uuid:service_id>/<uuid:template_id>/check/<uuid:upload_id>/row-<int:row_index>.<filetype>",
     methods=['GET'],
 )
@@ -673,7 +673,7 @@ def check_messages_preview(service_id, template_id, upload_id, filetype, row_ind
     return TemplatePreview.from_utils_template(template, filetype, page=page)
 
 
-@main.route(
+@no_cookie.route(
     "/services/<uuid:service_id>/<uuid:template_id>/check.<filetype>",
     methods=['GET'],
 )
@@ -868,7 +868,7 @@ def _check_notification(service_id, template_id, exception=None):
         email_reply_to=email_reply_to,
         sms_sender=sms_sender,
         letter_preview_url=url_for(
-            '.check_notification_preview',
+            'no_cookie.check_notification_preview',
             service_id=service_id,
             template_id=template_id,
             filetype='png',
diff --git a/app/main/views/templates.py b/app/main/views/templates.py
index 0e5fbf4f0..3d4f18ee4 100644
--- a/app/main/views/templates.py
+++ b/app/main/views/templates.py
@@ -16,7 +16,7 @@ from app import (
     template_folder_api_client,
     template_statistics_client,
 )
-from app.main import main
+from app.main import main, no_cookie
 from app.main.forms import (
     EmailTemplateForm,
     LetterTemplateForm,
@@ -67,7 +67,7 @@ def view_template(service_id, template_id):
             template,
             current_service,
             letter_preview_url=url_for(
-                '.view_letter_template_preview',
+                'no_cookie.view_letter_template_preview',
                 service_id=service_id,
                 template_id=template_id,
                 filetype='png',
@@ -219,7 +219,7 @@ def get_template_nav_items(template_folder_id):
     ]
 
 
-@main.route("/services/<uuid:service_id>/templates/<uuid:template_id>.<filetype>")
+@no_cookie.route("/services/<uuid:service_id>/templates/<uuid:template_id>.<filetype>")
 @user_has_permissions()
 def view_letter_template_preview(service_id, template_id, filetype):
     if filetype not in ('pdf', 'png'):
@@ -230,7 +230,7 @@ def view_letter_template_preview(service_id, template_id, filetype):
     return TemplatePreview.from_database_object(db_template, filetype, page=request.args.get('page'))
 
 
-@main.route("/templates/letter-preview-image/<filename>")
+@no_cookie.route("/templates/letter-preview-image/<filename>")
 @user_is_platform_admin
 def letter_branding_preview_image(filename):
     template = {
@@ -262,7 +262,7 @@ def _view_template_version(service_id, template_id, version, letters_as_pdf=Fals
         current_service.get_template(template_id, version=version),
         current_service,
         letter_preview_url=url_for(
-            '.view_template_version_preview',
+            'no_cookie.view_template_version_preview',
             service_id=service_id,
             template_id=template_id,
             version=version,
@@ -280,7 +280,7 @@ def view_template_version(service_id, template_id, version):
     )
 
 
-@main.route("/services/<uuid:service_id>/templates/<uuid:template_id>/version/<int:version>.<filetype>")
+@no_cookie.route("/services/<uuid:service_id>/templates/<uuid:template_id>/version/<int:version>.<filetype>")
 @user_has_permissions()
 def view_template_version_preview(service_id, template_id, version, filetype):
     db_template = current_service.get_template(template_id, version=version)
@@ -697,7 +697,7 @@ def delete_service_template(service_id, template_id):
             template,
             current_service,
             letter_preview_url=url_for(
-                '.view_letter_template_preview',
+                'no_cookie.view_letter_template_preview',
                 service_id=service_id,
                 template_id=template['id'],
                 filetype='png',
@@ -719,7 +719,7 @@ def confirm_redact_template(service_id, template_id):
             template,
             current_service,
             letter_preview_url=url_for(
-                '.view_letter_template_preview',
+                'no_cookie.view_letter_template_preview',
                 service_id=service_id,
                 template_id=template_id,
                 filetype='png',
@@ -759,7 +759,7 @@ def view_template_versions(service_id, template_id):
                 template,
                 current_service,
                 letter_preview_url=url_for(
-                    '.view_template_version_preview',
+                    'no_cookie.view_template_version_preview',
                     service_id=service_id,
                     template_id=template_id,
                     version=template['version'],
diff --git a/app/navigation.py b/app/navigation.py
index 16778e135..018c903e4 100644
--- a/app/navigation.py
+++ b/app/navigation.py
@@ -12,7 +12,8 @@ class Navigation:
     def __init__(self):
         self.mapping = {
             navigation: {
-                'main.{}'.format(endpoint) for endpoint in endpoints
+                # if not specified, assume endpoints are all in the `main` blueprint.
+                self._get_endpoint_with_blueprint(endpoint) for endpoint in endpoints
             } for navigation, endpoints in self.mapping.items()
         }
 
@@ -26,7 +27,7 @@ class Navigation:
     @property
     def endpoints_without_navigation(self):
         return tuple(
-            'main.{}'.format(endpoint) for endpoint in self.exclude
+            self._get_endpoint_with_blueprint(endpoint) for endpoint in self.exclude
         ) + ('static', 'status.show_status')
 
     def is_selected(self, navigation_item):
@@ -34,6 +35,10 @@ class Navigation:
             return self.selected_attribute
         return ''
 
+    @staticmethod
+    def _get_endpoint_with_blueprint(endpoint):
+        return endpoint if '.' in endpoint else 'main.{}'.format(endpoint)
+
 
 class HeaderNavigation(Navigation):
 
@@ -141,9 +146,9 @@ class HeaderNavigation(Navigation):
         'check_and_resend_text_code',
         'check_and_resend_verification_code',
         'check_messages',
-        'check_messages_preview',
+        'no_cookie.check_messages_preview',
         'check_notification',
-        'check_notification_preview',
+        'no_cookie.check_notification_preview',
         'choose_account',
         'choose_service',
         'choose_template',
@@ -201,7 +206,7 @@ class HeaderNavigation(Navigation):
         'information_security',
         'invite_org_user',
         'invite_user',
-        'letter_branding_preview_image',
+        'no_cookie.letter_branding_preview_image',
         'letter_template',
         'link_service_to_organisation',
         'manage_org_users',
@@ -243,7 +248,7 @@ class HeaderNavigation(Navigation):
         'send_one_off',
         'send_one_off_step',
         'send_test',
-        'send_test_preview',
+        'no_cookie.send_test_preview',
         'send_test_step',
         'send_uploaded_letter',
         'service_add_email_reply_to',
@@ -313,7 +318,7 @@ class HeaderNavigation(Navigation):
         'view_job_updates',
         'view_jobs',
         'view_letter_notification_as_preview',
-        'view_letter_template_preview',
+        'no_cookie.view_letter_template_preview',
         'view_letter_upload_as_preview',
         'view_notification',
         'view_notification_updates',
@@ -321,7 +326,7 @@ class HeaderNavigation(Navigation):
         'view_notifications_csv',
         'view_template',
         'view_template_version',
-        'view_template_version_preview',
+        'no_cookie.view_template_version_preview',
         'view_template_versions',
         'whitelist',
     }
@@ -363,7 +368,7 @@ class MainNavigation(Navigation):
             'send_one_off',
             'send_one_off_step',
             'send_test',
-            'send_test_preview',
+            'no_cookie.send_test_preview',
             'send_test_step',
             'set_sender',
             'set_template_sender',
@@ -465,8 +470,8 @@ class MainNavigation(Navigation):
         'cancel_letter_job',
         'check_and_resend_text_code',
         'check_and_resend_verification_code',
-        'check_messages_preview',
-        'check_notification_preview',
+        'no_cookie.check_messages_preview',
+        'no_cookie.check_notification_preview',
         'choose_account',
         'choose_service',
         'clear_cache',
@@ -520,7 +525,7 @@ class MainNavigation(Navigation):
         'integration_testing',
         'invite_org_user',
         'letter_branding',
-        'letter_branding_preview_image',
+        'no_cookie.letter_branding_preview_image',
         'live_services',
         'live_services_csv',
         'letter_template',
@@ -611,13 +616,13 @@ class MainNavigation(Navigation):
         'view_job_csv',
         'view_job_updates',
         'view_letter_notification_as_preview',
-        'view_letter_template_preview',
+        'no_cookie.view_letter_template_preview',
         'view_letter_upload_as_preview',
         'view_notification_updates',
         'view_notifications_csv',
         'view_provider',
         'view_providers',
-        'view_template_version_preview',
+        'no_cookie.view_template_version_preview',
     }
 
 
@@ -671,9 +676,9 @@ class CaseworkNavigation(Navigation):
         'check_and_resend_text_code',
         'check_and_resend_verification_code',
         'check_messages',
-        'check_messages_preview',
+        'no_cookie.check_messages_preview',
         'check_notification',
-        'check_notification_preview',
+        'no_cookie.check_notification_preview',
         'choose_account',
         'choose_service',
         'choose_template_to_copy',
@@ -747,7 +752,7 @@ class CaseworkNavigation(Navigation):
         'integration_testing',
         'invite_org_user',
         'invite_user',
-        'letter_branding_preview_image',
+        'no_cookie.letter_branding_preview_image',
         'letter_branding',
         'letter_template',
         'link_service_to_organisation',
@@ -799,7 +804,7 @@ class CaseworkNavigation(Navigation):
         'security',
         'send_messages',
         'send_notification',
-        'send_test_preview',
+        'no_cookie.send_test_preview',
         'send_uploaded_letter',
         'service_add_email_reply_to',
         'service_add_letter_contact',
@@ -892,7 +897,7 @@ class CaseworkNavigation(Navigation):
         'view_job_csv',
         'view_job_updates',
         'view_letter_notification_as_preview',
-        'view_letter_template_preview',
+        'no_cookie.view_letter_template_preview',
         'view_letter_upload_as_preview',
         'view_notification_updates',
         'view_notifications_csv',
@@ -900,7 +905,7 @@ class CaseworkNavigation(Navigation):
         'view_providers',
         'view_template',
         'view_template_version',
-        'view_template_version_preview',
+        'no_cookie.view_template_version_preview',
         'view_template_versions',
         'whitelist',
     }
@@ -966,9 +971,9 @@ class OrgNavigation(Navigation):
         'check_and_resend_text_code',
         'check_and_resend_verification_code',
         'check_messages',
-        'check_messages_preview',
+        'no_cookie.check_messages_preview',
         'check_notification',
-        'check_notification_preview',
+        'no_cookie.check_notification_preview',
         'choose_account',
         'choose_service',
         'choose_template',
@@ -1030,7 +1035,7 @@ class OrgNavigation(Navigation):
         'integration_testing',
         'invite_user',
         'letter_branding',
-        'letter_branding_preview_image',
+        'no_cookie.letter_branding_preview_image',
         'letter_template',
         'link_service_to_organisation',
         'live_services',
@@ -1077,7 +1082,7 @@ class OrgNavigation(Navigation):
         'send_one_off',
         'send_one_off_step',
         'send_test',
-        'send_test_preview',
+        'no_cookie.send_test_preview',
         'send_test_step',
         'send_uploaded_letter',
         'service_add_email_reply_to',
@@ -1176,7 +1181,7 @@ class OrgNavigation(Navigation):
         'view_job_updates',
         'view_jobs',
         'view_letter_notification_as_preview',
-        'view_letter_template_preview',
+        'no_cookie.view_letter_template_preview',
         'view_letter_upload_as_preview',
         'view_notification',
         'view_notification_updates',
@@ -1186,7 +1191,7 @@ class OrgNavigation(Navigation):
         'view_providers',
         'view_template',
         'view_template_version',
-        'view_template_version_preview',
+        'no_cookie.view_template_version_preview',
         'view_template_versions',
         'whitelist',
     }
diff --git a/app/templates/views/check/ok.html b/app/templates/views/check/ok.html
index b6e3012b7..1cd0c1601 100644
--- a/app/templates/views/check/ok.html
+++ b/app/templates/views/check/ok.html
@@ -47,7 +47,7 @@
       {% if (template.template_type != 'letter' or not request.args.from_test) and not letter_too_long %}
       <button type="submit" class="button">Send {{ count_of_recipients|format_thousands }} {{ message_count_label(count_of_recipients, template.template_type, suffix='') }}</button>
       {% else %}
-        <a href="{{ url_for('main.check_messages_preview', service_id=current_service.id, template_id=template.id, upload_id=upload_id, filetype='pdf') }}" download class="button">Download as a PDF</a>
+        <a href="{{ url_for('no_cookie.check_messages_preview', service_id=current_service.id, template_id=template.id, upload_id=upload_id, filetype='pdf') }}" download class="button">Download as a PDF</a>
       {% endif %}
     </form>
   </div>
diff --git a/app/templates/views/notifications/check.html b/app/templates/views/notifications/check.html
index 259063021..ce831a5bd 100644
--- a/app/templates/views/notifications/check.html
+++ b/app/templates/views/notifications/check.html
@@ -79,7 +79,7 @@
         <button type="submit" class="button">Send 1 {{ message_count_label(1, template.template_type, suffix='') }}</button>
       {% endif %}
       {% if template.template_type == 'letter' %}
-        <a href="{{ url_for('main.check_notification_preview', service_id=current_service.id, template_id=template.id, filetype='pdf') }}" download class="page-footer-right-aligned-link{% if error %}-without-button{% endif %}">Download as a PDF</a>
+        <a href="{{ url_for('no_cookie.check_notification_preview', service_id=current_service.id, template_id=template.id, filetype='pdf') }}" download class="page-footer-right-aligned-link{% if error %}-without-button{% endif %}">Download as a PDF</a>
       {% endif %}
     </form>
   </div>
diff --git a/tests/app/main/views/test_index.py b/tests/app/main/views/test_index.py
index fb6c49956..2e652200b 100644
--- a/tests/app/main/views/test_index.py
+++ b/tests/app/main/views/test_index.py
@@ -226,7 +226,7 @@ def test_letter_template_preview_links_to_the_correct_image(
     image_link = page.find('img')['src']
 
     assert image_link == url_for(
-        'main.letter_branding_preview_image',
+        'no_cookie.letter_branding_preview_image',
         filename=filename,
         page=1
     )
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index 2f72386ea..e44234910 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -775,7 +775,7 @@ def test_upload_valid_csv_only_sets_meta_if_filename_known(
     )
 
     client_request.get(
-        'main.check_messages_preview',
+        'no_cookie.check_messages_preview',
         service_id=SERVICE_ONE_ID,
         template_id=fake_uuid,
         upload_id=fake_uuid,
@@ -1992,7 +1992,7 @@ def test_send_test_works_as_letter_preview(
         session['placeholders'] = {'address_line_1': 'Jo Lastname'}
     response = platform_admin_client.get(
         url_for(
-            'main.send_test_preview',
+            'no_cookie.send_test_preview',
             service_id=service_id,
             template_id=template_id,
             filetype=filetype
@@ -2384,7 +2384,7 @@ def test_should_show_preview_letter_message(
 
     response = platform_admin_client.get(
         url_for(
-            'main.check_messages_preview',
+            'no_cookie.check_messages_preview',
             service_id=service_id,
             template_id=fake_uuid,
             upload_id=fake_uuid,
@@ -2412,7 +2412,7 @@ def test_dont_show_preview_letter_templates_for_bad_filetype(
 ):
     resp = logged_in_client.get(
         url_for(
-            'main.check_messages_preview',
+            'no_cookie.check_messages_preview',
             service_id=service_one['id'],
             template_id=fake_uuid,
             upload_id=fake_uuid,
@@ -3130,7 +3130,7 @@ def test_one_off_letters_have_download_link(
     assert len(page.select('.letter img')) == 5
 
     assert page.select_one('a[download]')['href'] == url_for(
-        'main.check_notification_preview',
+        'no_cookie.check_notification_preview',
         service_id=SERVICE_ONE_ID,
         template_id=fake_uuid,
         filetype='pdf',
diff --git a/tests/app/main/views/test_templates.py b/tests/app/main/views/test_templates.py
index d95e91465..29bce646b 100644
--- a/tests/app/main/views/test_templates.py
+++ b/tests/app/main/views/test_templates.py
@@ -773,8 +773,8 @@ def test_should_show_page_template_with_priority_select_if_platform_admin(
 
 @pytest.mark.parametrize('filetype', ['pdf', 'png'])
 @pytest.mark.parametrize('view, extra_view_args', [
-    ('.view_letter_template_preview', {}),
-    ('.view_template_version_preview', {'version': 1}),
+    ('no_cookie.view_letter_template_preview', {}),
+    ('no_cookie.view_template_version_preview', {'version': 1}),
 ])
 def test_should_show_preview_letter_templates(
     view,
@@ -817,7 +817,7 @@ def test_dont_show_preview_letter_templates_for_bad_filetype(
 ):
     resp = logged_in_client.get(
         url_for(
-            '.view_letter_template_preview',
+            'no_cookie.view_letter_template_preview',
             service_id=service_one['id'],
             template_id=fake_uuid,
             filetype='blah'
@@ -842,7 +842,7 @@ def test_letter_branding_preview_image(
         return_value='foo'
     )
     resp = platform_admin_client.get(
-        url_for('.letter_branding_preview_image', filename=original_filename)
+        url_for('no_cookie.letter_branding_preview_image', filename=original_filename)
     )
 
     mocked_preview.assert_called_with(ANY, new_filename)