diff --git a/app/main/forms.py b/app/main/forms.py
index fc7f7549b..3ac908a59 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -684,6 +684,17 @@ class ServiceSwitchLettersForm(StripWhitespaceForm):
     )
 
 
+class ServicePostageForm(StripWhitespaceForm):
+
+    postage = RadioField(
+        'Choose your postage',
+        choices=[
+            ('first', 'First class only'),
+            ('second', 'Second class only'),
+        ],
+    )
+
+
 class BrandingStyle(RadioField):
 
     def post_validate(self, form, validation_stopped):
diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index 5cf9390db..d25160b6d 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -43,6 +43,7 @@ from app.main.forms import (
     ServiceEditInboundNumberForm,
     ServiceInboundNumberForm,
     ServiceLetterContactBlockForm,
+    ServicePostageForm,
     ServicePreviewBranding,
     ServiceReplyToEmailForm,
     ServiceSetBranding,
@@ -649,6 +650,19 @@ def service_set_letters(service_id):
     )
 
 
+@main.route("/services/<service_id>/service-settings/set-postage", methods=['GET', 'POST'])
+@login_required
+@user_is_platform_admin
+def service_set_postage(service_id):
+    form = ServicePostageForm(postage=current_service.postage)
+
+    if form.validate_on_submit():
+        service_api_client.update_service(service_id, postage=form.postage.data)
+        return redirect(url_for(".service_settings", service_id=service_id))
+
+    return render_template('views/service-settings/set-postage.html', form=form)
+
+
 @main.route("/services/<service_id>/service-settings/set-auth-type", methods=['GET'])
 @login_required
 @user_has_permissions('manage_service')
diff --git a/app/navigation.py b/app/navigation.py
index 1b9e556a5..36a126478 100644
--- a/app/navigation.py
+++ b/app/navigation.py
@@ -230,6 +230,7 @@ class HeaderNavigation(Navigation):
         'service_set_international_sms',
         'service_set_letter_contact_block',
         'service_set_letters',
+        'service_set_postage',
         'service_set_reply_to_email',
         'service_set_sms',
         'service_set_sms_prefix',
@@ -352,6 +353,7 @@ class MainNavigation(Navigation):
             'service_set_international_sms',
             'service_set_letter_contact_block',
             'service_set_letters',
+            'service_set_postage',
             'service_set_reply_to_email',
             'service_set_sms',
             'service_set_sms_prefix',
@@ -677,6 +679,7 @@ class CaseworkNavigation(Navigation):
         'service_set_international_sms',
         'service_set_letter_contact_block',
         'service_set_letters',
+        'service_set_postage',
         'service_set_reply_to_email',
         'service_set_sms',
         'service_set_sms_prefix',
@@ -905,6 +908,7 @@ class OrgNavigation(Navigation):
         'service_set_international_sms',
         'service_set_letter_contact_block',
         'service_set_letters',
+        'service_set_postage',
         'service_set_reply_to_email',
         'service_set_sms',
         'service_set_sms_prefix',
diff --git a/app/notify_client/models.py b/app/notify_client/models.py
index 10a5eefad..03a97851c 100644
--- a/app/notify_client/models.py
+++ b/app/notify_client/models.py
@@ -280,6 +280,7 @@ class Service(dict):
         'name',
         'organisation_type',
         'permissions',
+        'postage',
         'prefix_sms',
         'research_mode',
         'service_callback_api',
diff --git a/app/notify_client/service_api_client.py b/app/notify_client/service_api_client.py
index 73ac7b6f3..26a1fe79f 100644
--- a/app/notify_client/service_api_client.py
+++ b/app/notify_client/service_api_client.py
@@ -88,6 +88,7 @@ class ServiceAPIClient(NotifyAdminAPIClient):
             'free_sms_fragment_limit',
             'prefix_sms',
             'contact_link',
+            'postage',
         }
         if disallowed_attributes:
             raise TypeError('Not allowed to update service attributes: {}'.format(
diff --git a/app/templates/views/service-settings.html b/app/templates/views/service-settings.html
index ad6b64909..0314769af 100644
--- a/app/templates/views/service-settings.html
+++ b/app/templates/views/service-settings.html
@@ -235,6 +235,21 @@
           )}}
         {% endcall %}
 
+        {% if current_user.platform_admin %}
+          {% call row() %}
+            {{ text_field('Postage') }}
+              {% set postage = {'first': 'First class only', 'second': 'Second class only'} %}
+              {{ text_field(postage[current_service.postage]) }}
+            {{ edit_field(
+                'Change',
+                url_for('.service_set_postage',
+                service_id=current_service.id),
+                permissions=['manage_service']
+            )
+            }}
+          {% endcall %}
+        {% endif %}
+
       {% endcall %}
     </div>
 
diff --git a/app/templates/views/service-settings/set-postage.html b/app/templates/views/service-settings/set-postage.html
new file mode 100644
index 000000000..995b1fc3b
--- /dev/null
+++ b/app/templates/views/service-settings/set-postage.html
@@ -0,0 +1,39 @@
+{% extends "withnav_template.html" %}
+{% from "components/radios.html" import radios %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block service_page_title %}
+  Postage
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  <div class="grid-row">
+    <div class="column-five-sixths">
+      <h1 class="heading-large">Postage</h1>
+      <p>You can send letters by first or second class post.</p>
+      <p>
+        See a list of <a href="{{ url_for('.pricing', _anchor='letters') }}">postage prices</a>.
+      </p>
+      <h2 class="heading-medium">Delivery times</h2>
+      <p>
+        Letters sent before 5:30pm are dispatched the next working day (Monday to Friday).
+      </p>
+      <p>
+        First class letters are delivered one day after they’re dispatched. Second class letters are delivered 2 days after they’re dispatched.
+      </p>
+      <p>
+        Royal Mail delivers from Monday to Saturday, excluding bank holidays.
+      </p>
+      <form method="post">
+        {{ radios(form.postage) }}
+        {{ page_footer(
+          'Save',
+          back_link=url_for('.service_settings', service_id=current_service.id),
+          back_link_text='Back to settings'
+        ) }}
+      </form>
+    </div>
+  </div>
+
+{% endblock %}
diff --git a/tests/__init__.py b/tests/__init__.py
index 1d626d4cb..6f412363e 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -146,6 +146,7 @@ def service_json(
     organisation_type='central',
     prefix_sms=True,
     contact_link=None,
+    postage='second',
 ):
     if users is None:
         users = []
@@ -174,6 +175,7 @@ def service_json(
         'inbound_api': inbound_api,
         'service_callback_api': service_callback_api,
         'prefix_sms': prefix_sms,
+        'postage': postage,
     }
 
 
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index abace066a..cab7f38e8 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -89,6 +89,7 @@ def mock_get_service_settings_page_common(
 
         'Label Value Action',
         'Send letters Off Change',
+        'Postage Second class only Change',
 
         'Label Value Action',
         'Organisation Org 1 Change',
@@ -1849,6 +1850,38 @@ def test_set_letter_branding_saves(
     mock_update_service.assert_called_once_with(service_one['id'], dvla_organisation='500')
 
 
+def test_set_postage_platform_admin_only(
+    logged_in_client,
+    service_one,
+):
+    response = logged_in_client.get(url_for('main.service_set_postage', service_id=SERVICE_ONE_ID))
+    assert response.status_code == 403
+
+
+def test_set_postage_prepopulates(
+    logged_in_platform_admin_client,
+    service_one,
+):
+    response = logged_in_platform_admin_client.get(url_for('main.service_set_postage', service_id=SERVICE_ONE_ID))
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert page.select('input[checked]')[0]['value'] == 'second'
+
+
+def test_set_postage_saves(
+    logged_in_platform_admin_client,
+    service_one,
+    mock_update_service,
+):
+    response = logged_in_platform_admin_client.post(
+        url_for('main.service_set_postage', service_id=SERVICE_ONE_ID),
+        data={'postage': 'first'}
+    )
+    assert response.status_code == 302
+    assert response.location == url_for('main.service_settings', service_id=SERVICE_ONE_ID, _external=True)
+    mock_update_service.assert_called_once_with(SERVICE_ONE_ID, postage='first')
+
+
 @pytest.mark.parametrize('current_branding, expected_values, expected_labels', [
     (None, [
         'None', '1', '2', '3', '4', '5',