diff --git a/app/main/forms.py b/app/main/forms.py
index 0ab44e1ff..546bab1a4 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -181,7 +181,7 @@ class ForgivingIntegerField(StringField):
 
         if valuelist:
 
-            valuelist[0] = valuelist[0].replace(',', '')
+            valuelist[0] = valuelist[0].replace(',', '').replace(' ', '')
 
             try:
                 valuelist[0] = int(valuelist[0])
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index 1eb68e16a..82c79827d 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -927,7 +927,7 @@ def test_should_show_persist_estimated_volumes(
     ),
     (
         {
-            'volume_email': '1234',
+            'volume_email': '1 234',
             'volume_sms': '0',
             'volume_letter': '9876',
             'consent_to_research': '',
@@ -963,7 +963,7 @@ def test_should_error_if_all_volumes_zero(
         _data={
             'volume_email': '',
             'volume_sms': '0',
-            'volume_letter': '0,000',
+            'volume_letter': '0,00 0',
             'consent_to_research': 'yes',
         },
         _expected_status=200,