diff --git a/app/config.py b/app/config.py
index a03d4aabd..9fc40bc5b 100644
--- a/app/config.py
+++ b/app/config.py
@@ -84,6 +84,8 @@ class Config(object):
     ASSET_DOMAIN = ''
     ASSET_PATH = '/static/'
 
+    BROADCAST_ORGANISATION_ID = os.environ.get('BROADCAST_ORGANISATION_ID')
+
     NOTIFY_SERVICE_ID = 'd6aa2c68-a2d9-4437-ab19-3ae8eb202553'
 
 
@@ -177,6 +179,8 @@ class Live(Config):
     ASSET_DOMAIN = 'static.notifications.service.gov.uk'
     ASSET_PATH = 'https://static.notifications.service.gov.uk/'
 
+    BROADCAST_ORGANISATION_ID = '38e4bf69-93b0-445d-acee-53ea53fe02df'
+
 
 class CloudFoundryConfig(Config):
     pass
diff --git a/app/models/service.py b/app/models/service.py
index 876aa2a39..906939da6 100644
--- a/app/models/service.py
+++ b/app/models/service.py
@@ -100,9 +100,16 @@ class Service(JSONModel):
         )
 
     def force_broadcast_permission_on(self):
-        return self.update_permissions(
+        ret = self.update_permissions(
             set(self.permissions) - {'email', 'sms', 'letter'} | {'broadcast'}
         )
+        broadcast_org_id = current_app.config['BROADCAST_ORGANISATION_ID']
+        if broadcast_org_id:
+            organisations_client.update_service_organisation(
+                service_id=self.id,
+                org_id=broadcast_org_id
+            )
+        return ret
 
     def update_permissions(self, permissions):
         return self.update(permissions=list(permissions))
diff --git a/tests/app/main/views/service_settings/test_service_setting_permissions.py b/tests/app/main/views/service_settings/test_service_setting_permissions.py
index 455e56538..57b74adbd 100644
--- a/tests/app/main/views/service_settings/test_service_setting_permissions.py
+++ b/tests/app/main/views/service_settings/test_service_setting_permissions.py
@@ -4,7 +4,7 @@ import pytest
 from flask import url_for
 
 from app.main.views.service_settings import PLATFORM_ADMIN_SERVICE_PERMISSIONS
-from tests.conftest import normalize_spaces
+from tests.conftest import SERVICE_ONE_ID, normalize_spaces, set_config
 
 
 @pytest.fixture
@@ -215,3 +215,38 @@ def test_normal_user_doesnt_see_any_platform_admin_settings(
 
     for permission in platform_admin_settings:
         assert permission not in page
+
+
+def test_setting_broadcast_sets_organisation_if_config_value_set(
+    mock_update_service_organisation,
+    mock_update_service,
+    platform_admin_client,
+    fake_uuid,
+):
+    with set_config(platform_admin_client.application, 'BROADCAST_ORGANISATION_ID', fake_uuid):
+        response = platform_admin_client.post(
+            url_for('main.service_set_permission', service_id=SERVICE_ONE_ID, permission='broadcast'),
+            data={'enabled': True}
+        )
+        assert response.status_code == 302
+        assert response.location == url_for('main.service_settings', service_id=SERVICE_ONE_ID, _external=True)
+
+    mock_update_service_organisation.assert_called_once_with(
+        service_id=SERVICE_ONE_ID,
+        org_id=fake_uuid
+    )
+
+
+def test_setting_broadcast_doesnt_set_organisation_if_config_value_not_set(
+    mock_update_service_organisation,
+    mock_update_service,
+    platform_admin_client,
+):
+    with set_config(platform_admin_client.application, 'BROADCAST_ORGANISATION_ID', None):
+        response = platform_admin_client.post(
+            url_for('main.service_set_permission', service_id=SERVICE_ONE_ID, permission='broadcast'),
+            data={'enabled': True}
+        )
+        assert response.status_code == 302
+        assert response.location == url_for('main.service_settings', service_id=SERVICE_ONE_ID, _external=True)
+    assert not mock_update_service_organisation.called
diff --git a/tests/conftest.py b/tests/conftest.py
index 6fd103601..40b1f22b2 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3360,7 +3360,7 @@ def mock_get_service_organisation(
 
 @pytest.fixture(scope='function')
 def mock_update_service_organisation(mocker):
-    def _update_service_organisation(service_id, organisation_id):
+    def _update_service_organisation(service_id, org_id):
         return
 
     return mocker.patch(
@@ -3504,7 +3504,7 @@ def mock_organisation_name_is_unique(mocker):
 
 @pytest.fixture(scope='function')
 def mock_update_organisation(mocker):
-    def _update_org(organisation_id, **kwargs):
+    def _update_org(org, **kwargs):
         return
 
     return mocker.patch('app.organisations_client.update_organisation', side_effect=_update_org)