diff --git a/app/main/views/organisations.py b/app/main/views/organisations.py
index 38f42ec8a..6e94d3a0f 100644
--- a/app/main/views/organisations.py
+++ b/app/main/views/organisations.py
@@ -216,8 +216,11 @@ def edit_organisation_type(org_id):
     )
 
     if form.validate_on_submit():
+        org_service_ids = [service['id'] for service in current_organisation.services]
+
         organisations_client.update_organisation(
             current_organisation.id,
+            cached_service_ids=org_service_ids,
             organisation_type=form.organisation_type.data,
         )
         return redirect(url_for('.organisation_settings', org_id=org_id))
diff --git a/app/notify_client/organisations_api_client.py b/app/notify_client/organisations_api_client.py
index a31625784..b984c21fb 100644
--- a/app/notify_client/organisations_api_client.py
+++ b/app/notify_client/organisations_api_client.py
@@ -2,6 +2,7 @@ from itertools import chain
 
 from notifications_python_client.errors import HTTPError
 
+from app.extensions import redis_client
 from app.notify_client import NotifyAdminAPIClient, _attach_current_user, cache
 
 
@@ -45,8 +46,13 @@ class OrganisationsClient(NotifyAdminAPIClient):
 
     @cache.delete('domains')
     @cache.delete('organisations')
-    def update_organisation(self, org_id, **kwargs):
-        return self.post(url="/organisations/{}".format(org_id), data=kwargs)
+    def update_organisation(self, org_id, cached_service_ids=None, **kwargs):
+        api_response = self.post(url="/organisations/{}".format(org_id), data=kwargs)
+
+        if kwargs.get('organisation_type') and cached_service_ids:
+            redis_client.delete(*map('service-{}'.format, cached_service_ids))
+
+        return api_response
 
     def update_organisation_name(self, org_id, name):
         return self.update_organisation(org_id, name=name)
diff --git a/tests/app/main/views/organisations/test_organisation.py b/tests/app/main/views/organisations/test_organisation.py
index 7e5eb5d34..cd7cd37fb 100644
--- a/tests/app/main/views/organisations/test_organisation.py
+++ b/tests/app/main/views/organisations/test_organisation.py
@@ -359,17 +359,17 @@ def test_view_organisation_settings(
     (
         '.edit_organisation_type',
         {'organisation_type': 'central'},
-        {'organisation_type': 'central'},
+        {'cached_service_ids': [], 'organisation_type': 'central'},
     ),
     (
         '.edit_organisation_type',
         {'organisation_type': 'local'},
-        {'organisation_type': 'local'},
+        {'cached_service_ids': [], 'organisation_type': 'local'},
     ),
     (
         '.edit_organisation_type',
         {'organisation_type': 'nhs_local'},
-        {'organisation_type': 'nhs_local'},
+        {'cached_service_ids': [], 'organisation_type': 'nhs_local'},
     ),
     (
         '.edit_organisation_crown_status',
@@ -412,6 +412,7 @@ def test_view_organisation_settings(
     ),
 ))
 def test_update_organisation_settings(
+    mocker,
     client_request,
     fake_uuid,
     organisation_one,
@@ -422,6 +423,7 @@ def test_update_organisation_settings(
     expected_persisted,
     user,
 ):
+    mocker.patch('app.organisations_client.get_organisation_services', return_value=[])
     client_request.login(user(fake_uuid))
 
     client_request.post(
@@ -442,6 +444,35 @@ def test_update_organisation_settings(
     )
 
 
+def test_update_organisation_sector_sends_service_id_data_to_api_client(
+    client_request,
+    mock_get_organisation,
+    organisation_one,
+    mock_get_organisation_services,
+    mock_update_organisation,
+    platform_admin_user,
+):
+    client_request.login(platform_admin_user)
+
+    client_request.post(
+        'main.edit_organisation_type',
+        org_id=organisation_one['id'],
+        _data={'organisation_type': 'central'},
+        _expected_status=302,
+        _expected_redirect=url_for(
+            'main.organisation_settings',
+            org_id=organisation_one['id'],
+            _external=True,
+        ),
+    )
+
+    mock_update_organisation.assert_called_once_with(
+        organisation_one['id'],
+        cached_service_ids=['12345', '67890', SERVICE_ONE_ID],
+        organisation_type='central'
+    )
+
+
 @pytest.mark.parametrize('user', (
     pytest.param(
         platform_admin_user,
diff --git a/tests/app/notify_client/test_organisation_client.py b/tests/app/notify_client/test_organisation_client.py
index d0cc36612..d171b0fb4 100644
--- a/tests/app/notify_client/test_organisation_client.py
+++ b/tests/app/notify_client/test_organisation_client.py
@@ -138,3 +138,57 @@ def test_deletes_domain_cache(
 
     assert call('domains') in mock_redis_delete.call_args_list
     assert len(mock_request.call_args_list) == 1
+
+
+def test_update_organisation_when_not_updating_org_type(mocker, fake_uuid):
+    mock_redis_delete = mocker.patch('app.extensions.RedisClient.delete')
+    mock_post = mocker.patch('app.notify_client.organisations_api_client.OrganisationsClient.post')
+
+    organisations_client.update_organisation(fake_uuid, foo='bar')
+
+    mock_post.assert_called_with(
+        url='/organisations/{}'.format(fake_uuid),
+        data={'foo': 'bar'}
+    )
+    assert mock_redis_delete.call_args_list == [call('domains'), call('organisations')]
+
+
+def test_update_organisation_when_updating_org_type_and_org_has_services(mocker, fake_uuid):
+    mock_redis_delete = mocker.patch('app.extensions.RedisClient.delete')
+    mock_post = mocker.patch('app.notify_client.organisations_api_client.OrganisationsClient.post')
+
+    organisations_client.update_organisation(
+        fake_uuid,
+        cached_service_ids=['a', 'b', 'c'],
+        organisation_type='central',
+    )
+
+    mock_post.assert_called_with(
+        url='/organisations/{}'.format(fake_uuid),
+        data={'organisation_type': 'central'}
+    )
+    assert mock_redis_delete.call_args_list == [
+        call('domains'),
+        call('organisations'),
+        call('service-a', 'service-b', 'service-c'),
+    ]
+
+
+def test_update_organisation_when_updating_org_type_but_org_has_no_services(mocker, fake_uuid):
+    mock_redis_delete = mocker.patch('app.extensions.RedisClient.delete')
+    mock_post = mocker.patch('app.notify_client.organisations_api_client.OrganisationsClient.post')
+
+    organisations_client.update_organisation(
+        fake_uuid,
+        cached_service_ids=[],
+        organisation_type='central',
+    )
+
+    mock_post.assert_called_with(
+        url='/organisations/{}'.format(fake_uuid),
+        data={'organisation_type': 'central'}
+    )
+    assert mock_redis_delete.call_args_list == [
+        call('domains'),
+        call('organisations'),
+    ]