diff --git a/app/dao/service_callback_api_dao.py b/app/dao/service_callback_api_dao.py
index 2a4f3ff3c..e9f42692d 100644
--- a/app/dao/service_callback_api_dao.py
+++ b/app/dao/service_callback_api_dao.py
@@ -2,9 +2,8 @@ from datetime import datetime
 
 from app import create_uuid, db
 from app.dao.dao_utils import autocommit, version_class
+from app.enums import CallbackType
 from app.models import (
-    COMPLAINT_CALLBACK_TYPE,
-    DELIVERY_STATUS_CALLBACK_TYPE,
     ServiceCallbackApi,
 )
 
@@ -40,13 +39,13 @@ def get_service_callback_api(service_callback_api_id, service_id):
 
 def get_service_delivery_status_callback_api_for_service(service_id):
     return ServiceCallbackApi.query.filter_by(
-        service_id=service_id, callback_type=DELIVERY_STATUS_CALLBACK_TYPE
+        service_id=service_id, callback_type=CallbackType.DELIVERY_STATUS,
     ).first()
 
 
 def get_service_complaint_callback_api_for_service(service_id):
     return ServiceCallbackApi.query.filter_by(
-        service_id=service_id, callback_type=COMPLAINT_CALLBACK_TYPE
+        service_id=service_id, callback_type=CallbackType.COMPLAINT,
     ).first()
 
 
diff --git a/app/dao/users_dao.py b/app/dao/users_dao.py
index 49e2c4d39..44098b1a6 100644
--- a/app/dao/users_dao.py
+++ b/app/dao/users_dao.py
@@ -9,8 +9,9 @@ from app import db
 from app.dao.dao_utils import autocommit
 from app.dao.permissions_dao import permission_dao
 from app.dao.service_user_dao import dao_get_service_users_by_user_id
+from app.enums import AuthType
 from app.errors import InvalidRequest
-from app.models import EMAIL_AUTH_TYPE, User, VerifyCode
+from app.models import User, VerifyCode
 from app.utils import escape_special_characters, get_archived_db_column_value
 
 
@@ -171,7 +172,7 @@ def dao_archive_user(user):
 
     user.organizations = []
 
-    user.auth_type = EMAIL_AUTH_TYPE
+    user.auth_type = AuthType.EMAIL
     user.email_address = get_archived_db_column_value(user.email_address)
     user.mobile_number = None
     user.password = str(uuid.uuid4())
diff --git a/app/delivery/send_to_providers.py b/app/delivery/send_to_providers.py
index 9910bc0b4..03d3ed3cc 100644
--- a/app/delivery/send_to_providers.py
+++ b/app/delivery/send_to_providers.py
@@ -15,12 +15,8 @@ from app.celery.test_key_tasks import send_email_response, send_sms_response
 from app.dao.email_branding_dao import dao_get_email_branding_by_id
 from app.dao.notifications_dao import dao_update_notification
 from app.dao.provider_details_dao import get_provider_details_by_notification_type
-from app.enums import NotificationStatus, NotificationType, KeyType
+from app.enums import NotificationStatus, NotificationType, KeyType, BrandType
 from app.exceptions import NotificationTechnicalFailureException
-from app.models import (
-    BRANDING_BOTH,
-    BRANDING_ORG_BANNER,
-)
 from app.serialised_models import SerialisedService, SerialisedTemplate
 
 
@@ -231,8 +227,8 @@ def get_html_email_options(service):
     )
 
     return {
-        "govuk_banner": branding.brand_type == BRANDING_BOTH,
-        "brand_banner": branding.brand_type == BRANDING_ORG_BANNER,
+        "govuk_banner": branding.brand_type == BrandType.BOTH,
+        "brand_banner": branding.brand_type == BrandType.ORG_BANNER,
         "brand_colour": branding.colour,
         "brand_logo": logo_url,
         "brand_text": branding.text,
diff --git a/app/organization/organization_schema.py b/app/organization/organization_schema.py
index fccfc1a8d..ad88fbeef 100644
--- a/app/organization/organization_schema.py
+++ b/app/organization/organization_schema.py
@@ -1,4 +1,4 @@
-from app.models import INVITED_USER_STATUS_TYPES, ORGANIZATION_TYPES
+from app.enums import InvitedUserStatus, OrganizationType
 from app.schema_validation.definitions import uuid
 
 post_create_organization_schema = {
@@ -8,7 +8,7 @@ post_create_organization_schema = {
     "properties": {
         "name": {"type": "string"},
         "active": {"type": ["boolean", "null"]},
-        "organization_type": {"enum": ORGANIZATION_TYPES},
+        "organization_type": {"enum": [e.value for e in OrganizationType]},
     },
     "required": ["name", "organization_type"],
 }
@@ -20,7 +20,7 @@ post_update_organization_schema = {
     "properties": {
         "name": {"type": ["string", "null"]},
         "active": {"type": ["boolean", "null"]},
-        "organization_type": {"enum": ORGANIZATION_TYPES},
+        "organization_type": {"enum": [e.value for e in OrganizationType]},
     },
     "required": [],
 }
@@ -51,6 +51,6 @@ post_update_invited_org_user_status_schema = {
     "$schema": "http://json-schema.org/draft-07/schema#",
     "description": "POST update organization invite schema",
     "type": "object",
-    "properties": {"status": {"enum": INVITED_USER_STATUS_TYPES}},
+    "properties": {"status": {"enum": [e.value for e in InvitedUserStatus]}},
     "required": ["status"],
 }
diff --git a/app/service/callback_rest.py b/app/service/callback_rest.py
index 94da0aead..ab25e3ca6 100644
--- a/app/service/callback_rest.py
+++ b/app/service/callback_rest.py
@@ -13,12 +13,9 @@ from app.dao.service_inbound_api_dao import (
     reset_service_inbound_api,
     save_service_inbound_api,
 )
+from app.enums import CallbackType
 from app.errors import InvalidRequest, register_errors
-from app.models import (
-    DELIVERY_STATUS_CALLBACK_TYPE,
-    ServiceCallbackApi,
-    ServiceInboundApi,
-)
+from app.models import ServiceCallbackApi, ServiceInboundApi
 from app.schema_validation import validate
 from app.service.service_callback_api_schema import (
     create_service_callback_api_schema,
@@ -90,7 +87,7 @@ def create_service_callback_api(service_id):
     data = request.get_json()
     validate(data, create_service_callback_api_schema)
     data["service_id"] = service_id
-    data["callback_type"] = DELIVERY_STATUS_CALLBACK_TYPE
+    data["callback_type"] = CallbackType.DELIVERY_STATUS
     callback_api = ServiceCallbackApi(**data)
     try:
         save_service_callback_api(callback_api)
diff --git a/app/service/send_notification.py b/app/service/send_notification.py
index 4bf13bec0..d0a9914cb 100644
--- a/app/service/send_notification.py
+++ b/app/service/send_notification.py
@@ -6,8 +6,7 @@ from app.dao.service_sms_sender_dao import dao_get_service_sms_senders_by_id
 from app.dao.services_dao import dao_fetch_service_by_id
 from app.dao.templates_dao import dao_get_template_by_id_and_service_id
 from app.dao.users_dao import get_user_by_id
-from app.enums import NotificationType, KeyType
-from app.models import PRIORITY
+from app.enums import NotificationType, KeyType, TemplateProcessType
 from app.notifications.process_notifications import (
     persist_notification,
     send_notification_to_queue,
@@ -81,7 +80,7 @@ def send_one_off_notification(service_id, post_data):
         client_reference=client_reference,
     )
 
-    queue_name = QueueNames.PRIORITY if template.process_type == PRIORITY else None
+    queue_name = QueueNames.PRIORITY if template.process_type == TemplateProcessType.PRIORITY else None
 
     send_notification_to_queue(
         notification=notification,
diff --git a/app/utils.py b/app/utils.py
index fc68acd86..833dce55f 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -78,13 +78,12 @@ def get_month_from_utc_column(column):
 
 
 def get_public_notify_type_text(notify_type, plural=False):
-    from app.enums import NotificationType
-    from app.models import UPLOAD_DOCUMENT
+    from app.enums import NotificationType, ServicePermissionType
 
     notify_type_text = notify_type
     if notify_type == NotificationType.SMS:
         notify_type_text = "text message"
-    elif notify_type == UPLOAD_DOCUMENT:
+    elif notify_type == ServicePermissionType.UPLOAD_DOCUMENT:
         notify_type_text = "document"
 
     return "{}{}".format(notify_type_text, "s" if plural else "")