diff --git a/tests/app/utils/test_branding.py b/tests/app/utils/test_branding.py
index e05007f27..c46a68d94 100644
--- a/tests/app/utils/test_branding.py
+++ b/tests/app/utils/test_branding.py
@@ -9,6 +9,7 @@ from app.utils.branding import (
     get_letter_choices,
 )
 from tests import organisation_json
+from tests.conftest import create_email_branding
 
 
 @pytest.mark.parametrize('function', [get_email_choices, get_letter_choices])
@@ -78,6 +79,46 @@ def test_get_email_choices_service_assigned_to_org(
     assert list(options) == expected_options
 
 
+@pytest.mark.parametrize('org_type, branding_id, expected_options', [
+    ('central', 'some-branding-id', [
+        # don't show GOV.UK options as org default supersedes it
+        ('organisation', 'Test Organisation'),
+    ]),
+    ('central', 'org-branding-id', [
+        # also don't show org option if it's the current branding
+    ]),
+    ('local', 'org-branding-id', [
+        # don't show org option if it's the current branding
+    ]),
+])
+def test_get_email_choices_org_has_default_branding(
+    mocker,
+    service_one,
+    org_type,
+    branding_id,
+    expected_options,
+    mock_get_service_organisation,
+    mock_get_email_branding
+):
+    service = Service(service_one)
+
+    mocker.patch(
+        'app.organisations_client.get_organisation',
+        return_value=organisation_json(
+            organisation_type=org_type,
+            email_branding_id='org-branding-id'
+        )
+    )
+    mocker.patch(
+        'app.models.service.Service.email_branding_id',
+        new_callable=PropertyMock,
+        return_value=branding_id
+    )
+
+    options = get_email_choices(service)
+    assert list(options) == expected_options
+
+
 @pytest.mark.parametrize('org_type, branding_id, expected_options', [
     ('central', None, [
         ('organisation', 'Test Organisation')
@@ -114,3 +155,39 @@ def test_get_letter_choices_service_assigned_to_org(
 
     options = get_letter_choices(service)
     assert list(options) == expected_options
+
+
+@pytest.mark.parametrize('branding_id, expected_options', [
+    ('some-branding-id', [
+        # show org option if it's not the current branding
+        ('organisation', 'Test Organisation'),
+    ]),
+    ('org-branding-id', [
+        # don't show org option if it's the current branding
+    ]),
+])
+def test_get_letter_choices_org_has_default_branding(
+    mocker,
+    service_one,
+    branding_id,
+    expected_options,
+    mock_get_service_organisation,
+):
+    service = Service(service_one)
+
+    mocker.patch(
+        'app.organisations_client.get_organisation',
+        return_value=organisation_json(
+            organisation_type='central',
+            letter_branding_id='org-branding-id'
+        )
+    )
+    mocker.patch(
+        'app.models.service.Service.letter_branding_id',
+        new_callable=PropertyMock,
+        return_value=branding_id
+    )
+
+    options = get_letter_choices(service)
+    # don't show org option if it's the current branding
+    assert list(options) == expected_options