diff --git a/portal/helpers/organisation.py b/cfl_common/common/helpers/organisation.py
similarity index 100%
rename from portal/helpers/organisation.py
rename to cfl_common/common/helpers/organisation.py
diff --git a/cfl_common/common/migrations/0041_populate_gb_counties.py b/cfl_common/common/migrations/0041_populate_gb_counties.py
index 2484c0851..e45f148b3 100644
--- a/cfl_common/common/migrations/0041_populate_gb_counties.py
+++ b/cfl_common/common/migrations/0041_populate_gb_counties.py
@@ -1,7 +1,7 @@
 import pgeocode
 from django.db import migrations
 
-from portal.helpers.organisation import sanitise_uk_postcode
+from ..helpers.organisation import sanitise_uk_postcode
 
 
 class Migration(migrations.Migration):
diff --git a/cfl_common/common/models.py b/cfl_common/common/models.py
index 704a741ff..cb2c7ee9d 100644
--- a/cfl_common/common/models.py
+++ b/cfl_common/common/models.py
@@ -8,7 +8,7 @@
 from django.utils import timezone
 from django_countries.fields import CountryField
 
-from portal.helpers.organisation import sanitise_uk_postcode
+from .helpers.organisation import sanitise_uk_postcode
 
 
 class UserProfile(models.Model):
diff --git a/cfl_common/common/tests/test_models.py b/cfl_common/common/tests/test_models.py
index 949350d2d..488cef54b 100644
--- a/cfl_common/common/tests/test_models.py
+++ b/cfl_common/common/tests/test_models.py
@@ -6,6 +6,7 @@
 from .utils.organisation import create_organisation_directly, join_teacher_to_organisation
 from .utils.student import create_independent_student_directly
 from .utils.teacher import signup_teacher_directly
+from ..helpers.organisation import sanitise_uk_postcode
 
 
 class TestModels(TestCase):
@@ -90,6 +91,15 @@ def test_school_postcode(self):
 
         assert school.county == ""
 
+    def test_sanitise_uk_postcode(self):
+        postcode_with_space = "AL10 9NE"
+        postcode_without_space = "AL109UL"
+        invalid_postcode = "123"
+
+        assert sanitise_uk_postcode(postcode_with_space) == "AL10 9NE"  # Check it stays the same
+        assert sanitise_uk_postcode(postcode_without_space) == "AL10 9UL"  # Check a space is added
+        assert sanitise_uk_postcode(invalid_postcode) == "123"  # Check nothing happens
+
     def test_daily_activity_serializer(self):
         daily_activity = DailyActivity()
 
diff --git a/portal/__init__.py b/portal/__init__.py
index b076d5803..09ed46c59 100644
--- a/portal/__init__.py
+++ b/portal/__init__.py
@@ -1 +1 @@
-__version__ = "6.36.0"
+__version__ = "6.36.2"
diff --git a/portal/helpers/ratelimit.py b/portal/helpers/ratelimit.py
index 1787e73b9..acf108842 100644
--- a/portal/helpers/ratelimit.py
+++ b/portal/helpers/ratelimit.py
@@ -161,7 +161,16 @@ def get_usage(request, group=None, fn=None, key=None, rate=None, method=ALL, inc
 
     cache_name = getattr(settings, "RATELIMIT_USE_CACHE", "default")
     cache = caches[cache_name]
-    cache_key = _make_cache_key(group, window, rate, value, method)
+
+    if value == "":
+        return {
+            "count": 0,
+            "limit": 0,
+            "should_limit": False,
+            "time_left": -1,
+        }
+    else:
+        cache_key = _make_cache_key(group, window, rate, value, method)
 
     count = None
     added = cache.add(cache_key, initial_value, period + EXPIRATION_FUDGE)
diff --git a/portal/tests/test_helper_methods.py b/portal/tests/test_helper_methods.py
index bff476c4f..23482b72c 100644
--- a/portal/tests/test_helper_methods.py
+++ b/portal/tests/test_helper_methods.py
@@ -2,7 +2,6 @@
 from unittest.mock import patch, Mock
 
 from portal.helpers.password import is_password_pwned
-from portal.helpers.organisation import sanitise_uk_postcode
 
 
 class TestClass:
@@ -29,12 +28,3 @@ def test_is_password_pwned__status_code_not_200(self, mock_get):
         # Assert
         mock_get.assert_called_once_with(f"https://api.pwnedpasswords.com/range/{sha1_hash[:5]}")
         assert not result
-
-    def test_sanitise_uk_postcode(self):
-        postcode_with_space = "AL10 9NE"
-        postcode_without_space = "AL109UL"
-        invalid_postcode = "123"
-
-        assert sanitise_uk_postcode(postcode_with_space) == "AL10 9NE"  # Check it stays the same
-        assert sanitise_uk_postcode(postcode_without_space) == "AL10 9UL"  # Check a space is added
-        assert sanitise_uk_postcode(invalid_postcode) == "123"  # Check nothing happens