diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index 8517aa2fd..d891164ea 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -286,6 +286,15 @@ def service_set_international_sms(service_id):
     )
 
 
+@main.route("/services/<service_id>/service-settings/set-letters", methods=['GET'])
+@login_required
+@user_has_permissions('manage_settings', admin_override=True)
+def service_set_letters(service_id):
+    return render_template(
+        'views/service-settings/set-letters.html',
+    )
+
+
 @main.route("/services/<service_id>/service-settings/set-letter-contact-block", methods=['GET', 'POST'])
 @login_required
 @user_has_permissions('manage_settings', admin_override=True)
diff --git a/app/templates/views/service-settings.html b/app/templates/views/service-settings.html
index eb3ed8c2d..b133d1aa6 100644
--- a/app/templates/views/service-settings.html
+++ b/app/templates/views/service-settings.html
@@ -39,12 +39,19 @@
           {{ text_field(current_service.sms_sender or '40604') }}
           {{ edit_field('Change', url_for('.service_set_sms_sender', service_id=current_service.id)) }}
         {% endcall %}
+
         {% call row() %}
           {{ text_field('International text messages') }}
           {{ text_field('On' if current_service.can_send_international_sms else 'Off') }}
           {{ edit_field('Change', url_for('.service_set_international_sms', service_id=current_service.id)) }}
         {% endcall %}
 
+        {% call row() %}
+          {{ text_field('Letters') }}
+          {{ text_field('On' if current_service.can_send_letters else 'Off') }}
+          {{ edit_field('Change', url_for('.service_set_letters', service_id=current_service.id)) }}
+        {% endcall %}
+
         {% if current_service.can_send_letters %}
           {% call row() %}
             {{ text_field('Letter contact details') }}
diff --git a/app/templates/views/service-settings/set-letters.html b/app/templates/views/service-settings/set-letters.html
new file mode 100644
index 000000000..1057ff45f
--- /dev/null
+++ b/app/templates/views/service-settings/set-letters.html
@@ -0,0 +1,38 @@
+{% extends "withnav_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block service_page_title %}
+  Text message sender
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  <div class="grid-row">
+    <div class="column-five-sixths">
+      <h1 class="heading-large">Letters</h1>
+      {% if current_service.can_send_letters %}
+        <p>
+          Your service can send letters.
+        </p>
+        <p>
+          If you want to stop your sending from sending letters,
+          <a href="{{ url_for('.support') }}">get in touch with the GOV.UK Notify team</a>.
+        </p>
+      {% else %}
+        <p>
+          Using GOV.UK Notify to send letters is an invitation&#8209;only feature.
+        </p>
+        <p>
+          If you want to try it out,
+          <a href="{{ url_for('.support') }}">get in touch with the GOV.UK Notify team</a>.
+        </p>
+      {% endif %}
+      {{ page_footer(
+        back_link=url_for('.service_settings', service_id=current_service.id),
+        back_link_text='Back to settings'
+      ) }}
+    </div>
+  </div>
+
+{% endblock %}
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index e55d5b9c5..9ac91dddd 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -9,6 +9,7 @@ from werkzeug.exceptions import InternalServerError
 import app
 from app.utils import email_safe
 from tests import validate_route_permission, service_json
+from tests.app.test_utils import normalize_spaces
 
 from tests.conftest import active_user_with_permissions, platform_admin_user
 
@@ -20,6 +21,7 @@ from tests.conftest import active_user_with_permissions, platform_admin_user
         'Email reply to address None Change',
         'Text message sender 40604 Change',
         'International text messages Off Change',
+        'Letters Off Change',
     ]),
     (platform_admin_user, [
         'Label Value Action',
@@ -27,6 +29,7 @@ from tests.conftest import active_user_with_permissions, platform_admin_user
         'Email reply to address None Change',
         'Text message sender 40604 Change',
         'International text messages Off Change',
+        'Letters Off Change',
         'Label Value Action',
         'Email branding GOV.UK Change',
         'Letter branding HM Government Change',
@@ -73,6 +76,7 @@ def test_should_show_overview_for_service_with_more_things_set(
         'Email reply to address test@example.com Change',
         'Text message sender elevenchars Change',
         'International text messages Off Change',
+        'Letters Off Change',
     ]):
         assert row == " ".join(page.find_all('tr')[index + 1].text.split())
 
@@ -100,7 +104,7 @@ def test_letter_contact_block_shows_none_if_not_set(
     ))
 
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
-    div = page.find_all('tr')[5].find_all('td')[1].div
+    div = page.find_all('tr')[6].find_all('td')[1].div
     assert div.text.strip() == 'None'
     assert 'default' in div.attrs['class'][0]
 
@@ -118,7 +122,7 @@ def test_escapes_letter_contact_block(
     ))
 
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
-    div = str(page.find_all('tr')[5].find_all('td')[1].div)
+    div = str(page.find_all('tr')[6].find_all('td')[1].div)
     assert 'foo<br>bar' in div
     assert '<script>' not in div
 
@@ -1015,3 +1019,32 @@ def test_cant_resume_active_service(
     assert response.status_code == 200
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
     assert 'Resume service' not in {a.text for a in page.find_all('a', class_='button')}
+
+
+@pytest.mark.parametrize('endpoint, expected_p', [
+    (
+        'main.service_set_international_sms',
+        (
+            'Sending text messages to international phone numbers is '
+            'an invitation‑only feature.'
+        )
+    ),
+    (
+        'main.service_set_letters',
+        (
+            'Using GOV.UK Notify to send letters is an invitation‑only '
+            'feature.'
+        )
+    ),
+])
+def test_invitation_pages(
+    logged_in_client,
+    service_one,
+    endpoint,
+    expected_p,
+):
+    response = logged_in_client.get(url_for(endpoint, service_id=service_one['id']))
+
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert normalize_spaces(page.select('main p')[0].text) == expected_p