diff --git a/app/main/views/platform_admin.py b/app/main/views/platform_admin.py
index 47dddc90f..a5f335bc2 100644
--- a/app/main/views/platform_admin.py
+++ b/app/main/views/platform_admin.py
@@ -417,7 +417,12 @@ def clear_cache():
         ('letter_branding', [
             'letter_branding',
             'letter_branding-????????-????-????-????-????????????',
-        ])
+        ]),
+        ('organisation', [
+            'organisations',
+            'domains',
+            'live-service-and-organisation-counts',
+        ]),
     ])
 
     form = ClearCacheForm()
diff --git a/app/notify_client/organisations_api_client.py b/app/notify_client/organisations_api_client.py
index ecec12359..c51982cdd 100644
--- a/app/notify_client/organisations_api_client.py
+++ b/app/notify_client/organisations_api_client.py
@@ -7,6 +7,7 @@ from app.notify_client import NotifyAdminAPIClient, _attach_current_user, cache
 
 class OrganisationsClient(NotifyAdminAPIClient):
 
+    @cache.set('organisations')
     def get_organisations(self):
         return self.get(url='/organisations')
 
@@ -30,6 +31,7 @@ class OrganisationsClient(NotifyAdminAPIClient):
                 return None
             raise error
 
+    @cache.delete('organisations')
     def create_organisation(self, name):
         data = {
             "name": name
@@ -37,6 +39,7 @@ class OrganisationsClient(NotifyAdminAPIClient):
         return self.post(url="/organisations", data=data)
 
     @cache.delete('domains')
+    @cache.delete('organisations')
     def update_organisation(self, org_id, **kwargs):
         return self.post(url="/organisations/{}".format(org_id), data=kwargs)
 
diff --git a/tests/app/main/views/test_platform_admin.py b/tests/app/main/views/test_platform_admin.py
index 2e0b5a765..ac05a3e7e 100644
--- a/tests/app/main/views/test_platform_admin.py
+++ b/tests/app/main/views/test_platform_admin.py
@@ -900,24 +900,42 @@ def test_clear_cache_shows_form(client_request, platform_admin_user, mocker):
     assert page.select('input[type=radio]')[0]['value'] == 'user'
     assert page.select('input[type=radio]')[1]['value'] == 'service'
     assert page.select('input[type=radio]')[2]['value'] == 'template'
+    assert page.select('input[type=radio]')[3]['value'] == 'email_branding'
+    assert page.select('input[type=radio]')[4]['value'] == 'letter_branding'
+    assert page.select('input[type=radio]')[5]['value'] == 'organisation'
     assert not redis.delete_cache_keys_by_pattern.called
 
 
-def test_clear_cache_submits_and_tells_you_how_many_things_were_deleted(client_request, platform_admin_user, mocker):
+@pytest.mark.parametrize('model_type, expected_calls, expected_confirmation', (
+    ('template', [
+        call('service-????????-????-????-????-????????????-templates'),
+        call('template-????????-????-????-????-????????????-version-*'),
+        call('template-????????-????-????-????-????????????-versions'),
+    ], 'Removed 3 template objects from redis'),
+    ('organisation', [
+        call('organisations'),
+        call('domains'),
+        call('live-service-and-organisation-counts'),
+    ], 'Removed 3 organisation objects from redis'),
+))
+def test_clear_cache_submits_and_tells_you_how_many_things_were_deleted(
+    client_request,
+    platform_admin_user,
+    mocker,
+    model_type,
+    expected_calls,
+    expected_confirmation,
+):
     redis = mocker.patch('app.main.views.platform_admin.redis_client')
     redis.delete_cache_keys_by_pattern.side_effect = [0, 3, 1]
     client_request.login(platform_admin_user)
 
-    page = client_request.post('main.clear_cache', _data={'model_type': 'template'}, _expected_status=200)
+    page = client_request.post('main.clear_cache', _data={'model_type': model_type}, _expected_status=200)
 
-    assert redis.delete_cache_keys_by_pattern.call_args_list == [
-        call('service-????????-????-????-????-????????????-templates'),
-        call('template-????????-????-????-????-????????????-version-*'),
-        call('template-????????-????-????-????-????????????-versions'),
-    ]
+    assert redis.delete_cache_keys_by_pattern.call_args_list == expected_calls
 
     flash_banner = page.find('div', class_='banner-default')
-    assert flash_banner.text.strip() == 'Removed 3 template objects from redis'
+    assert flash_banner.text.strip() == expected_confirmation
 
 
 def test_clear_cache_requires_option(client_request, platform_admin_user, mocker):
diff --git a/tests/app/notify_client/test_organisation_client.py b/tests/app/notify_client/test_organisation_client.py
index 7839cbdad..d0cc36612 100644
--- a/tests/app/notify_client/test_organisation_client.py
+++ b/tests/app/notify_client/test_organisation_client.py
@@ -7,6 +7,7 @@ from app import organisations_client
 
 @pytest.mark.parametrize(
     (
+        'client_method,'
         'expected_cache_get_calls,'
         'cache_value,'
         'expected_api_calls,'
@@ -15,13 +16,14 @@ from app import organisations_client
     ),
     [
         (
+            'get_domains',
             [
-                call('domains')
+                call('domains'),
             ],
             b"""
                 [
-                    {"domains": ["a", "b", "c"]},
-                    {"domains": ["c", "d", "e"]}
+                    {"name": "org 1", "domains": ["a", "b", "c"]},
+                    {"name": "org 2", "domains": ["c", "d", "e"]}
                 ]
             """,
             [],
@@ -29,19 +31,62 @@ from app import organisations_client
             ['a', 'b', 'c', 'd', 'e'],
         ),
         (
+            'get_domains',
             [
-                call('domains')
+                call('domains'),
+                call('organisations'),
             ],
             None,
             [
                 call(url='/organisations')
             ],
             [
+                call(
+                    'organisations',
+                    '[{"domains": ["x", "y", "z"]}]',
+                    ex=604800,
+                ),
                 call(
                     'domains',
                     '["x", "y", "z"]',
                     ex=604800
-                )
+                ),
+            ],
+            'from api',
+        ),
+        (
+            'get_organisations',
+            [
+                call('organisations'),
+            ],
+            b"""
+                [
+                    {"name": "org 1", "domains": ["a", "b", "c"]},
+                    {"name": "org 2", "domains": ["c", "d", "e"]}
+                ]
+            """,
+            [],
+            [],
+            [
+                {"name": "org 1", "domains": ["a", "b", "c"]},
+                {"name": "org 2", "domains": ["c", "d", "e"]}
+            ],
+        ),
+        (
+            'get_organisations',
+            [
+                call('organisations'),
+            ],
+            None,
+            [
+                call(url='/organisations')
+            ],
+            [
+                call(
+                    'organisations',
+                    '[{"domains": ["x", "y", "z"]}]',
+                    ex=604800,
+                ),
             ],
             'from api',
         ),
@@ -50,6 +95,7 @@ from app import organisations_client
 def test_returns_value_from_cache(
     app_,
     mocker,
+    client_method,
     expected_cache_get_calls,
     cache_value,
     expected_return_value,
@@ -71,7 +117,7 @@ def test_returns_value_from_cache(
         'app.extensions.RedisClient.set',
     )
 
-    organisations_client.get_domains()
+    getattr(organisations_client, client_method)()
 
     assert mock_redis_get.call_args_list == expected_cache_get_calls
     assert mock_api_get.call_args_list == expected_api_calls