diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index dfa382714..3d690bf2f 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -187,6 +187,9 @@ def estimate_usage(service_id):
 @main.route("/services/<uuid:service_id>/service-settings/request-to-go-live", methods=['GET'])
 @user_has_permissions('manage_service')
 def request_to_go_live(service_id):
+    if current_service.live:
+        return render_template('views/service-settings/service-already-live.html')
+
     return render_template(
         'views/service-settings/request-to-go-live.html'
     )
diff --git a/app/templates/views/service-settings/service-already-live.html b/app/templates/views/service-settings/service-already-live.html
new file mode 100644
index 000000000..950e0a094
--- /dev/null
+++ b/app/templates/views/service-settings/service-already-live.html
@@ -0,0 +1,28 @@
+{% extends "withnav_template.html" %}
+{% from "components/page-header.html" import page_header %}
+
+{% block service_page_title %}
+  Your service is already live
+{% endblock %}
+
+{% block maincolumn_content %}
+  <div class="govuk-grid-row">
+    <div class="govuk-grid-column-full">
+      {{ page_header('Your service is already live') }}
+
+      <p class="govuk-body">
+        {% if current_service.go_live_at %}
+          ‘{{ current_service.name }}’ went live on {{ current_service.go_live_at | format_date_normal }}.
+        {% else %}
+          ‘{{ current_service.name }}’ is already live.
+        {% endif %}
+        </p>
+
+      <p class="govuk-body">
+        <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.choose_account') }}">Switch service</a>
+         if you want to make a different service live.
+      </p>
+
+    </div>
+  </div>
+{% endblock %}
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index 61511985d..f69e8c74e 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -1037,6 +1037,28 @@ def test_should_not_show_go_live_button_if_checklist_not_complete(
         )
 
 
+@pytest.mark.parametrize('go_live_at, message', [
+    (None, '‘service one’ is already live.'),
+    ('2020-10-09 13:55:20', '‘service one’ went live on 9 October 2020.'),
+])
+def test_request_to_go_live_redirects_if_service_already_live(
+    client_request,
+    service_one,
+    go_live_at,
+    message,
+):
+    service_one['restricted'] = False
+    service_one['go_live_at'] = go_live_at
+
+    page = client_request.get(
+        'main.request_to_go_live',
+        service_id=SERVICE_ONE_ID,
+    )
+
+    assert page.h1.text == 'Your service is already live'
+    assert normalize_spaces(page.select_one('main p').text) == message
+
+
 @pytest.mark.parametrize((
     'estimated_sms_volume,'
     'organisation_type,'