diff --git a/app/authentication/auth.py b/app/authentication/auth.py
index 7201ad56f..7a744c039 100644
--- a/app/authentication/auth.py
+++ b/app/authentication/auth.py
@@ -63,6 +63,7 @@ class InternalApiKey():
 def requires_no_auth():
     pass
 
+
 def requires_admin_auth():
     requires_internal_auth(current_app.config.get('ADMIN_CLIENT_ID'))
 
diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index be09f3a74..15e5cff3d 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -7,7 +7,7 @@ from notifications_utils.clients.zendesk.zendesk_client import (
 from sqlalchemy import between
 from sqlalchemy.exc import SQLAlchemyError
 
-from app import db, notify_celery, zendesk_client
+from app import notify_celery, zendesk_client
 from app.aws import s3
 from app.celery.letters_pdf_tasks import get_pdf_for_templated_letter
 from app.celery.tasks import (
diff --git a/app/models.py b/app/models.py
index d5e0d9e14..61f345b66 100644
--- a/app/models.py
+++ b/app/models.py
@@ -34,7 +34,6 @@ from sqlalchemy.ext.associationproxy import association_proxy
 from sqlalchemy.ext.declarative import declared_attr
 from sqlalchemy.ext.hybrid import hybrid_property
 from sqlalchemy.orm.collections import attribute_mapped_collection
-from sqlalchemy.schema import Sequence
 
 from app import db, encryption
 from app.hashing import check_hash, hashpw
@@ -43,7 +42,6 @@ from app.utils import (
     DATETIME_FORMAT,
     DATETIME_FORMAT_NO_TIMEZONE,
     get_dt_string_or_none,
-    get_uuid_string_or_none,
 )
 
 SMS_TYPE = 'sms'
diff --git a/app/schemas.py b/app/schemas.py
index 1317ab33d..b83382350 100644
--- a/app/schemas.py
+++ b/app/schemas.py
@@ -234,7 +234,7 @@ class ServiceSchema(BaseSchema, UUIDsAsStringsMixin):
     email_branding = field_for(models.Service, 'email_branding')
     organisation = field_for(models.Service, 'organisation')
     go_live_at = field_for(models.Service, 'go_live_at', format=DATETIME_FORMAT_NO_TIMEZONE)
-    
+
     def get_letter_logo_filename(self, service):
         return service.letter_branding and service.letter_branding.filename
 
diff --git a/app/utils.py b/app/utils.py
index c04e37793..cc3368a67 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -95,7 +95,7 @@ def get_public_notify_type_text(notify_type, plural=False):
         notify_type_text = 'document'
     elif notify_type == PRECOMPILED_LETTER:
         notify_type_text = 'precompiled letter'
-    
+
     return '{}{}'.format(notify_type_text, 's' if plural else '')
 
 
diff --git a/tests/app/authentication/test_authentication.py b/tests/app/authentication/test_authentication.py
index 55bc59fc3..fe9a6cd1d 100644
--- a/tests/app/authentication/test_authentication.py
+++ b/tests/app/authentication/test_authentication.py
@@ -3,7 +3,7 @@ import uuid
 
 import jwt
 import pytest
-from flask import current_app, g, request
+from flask import g, request
 from notifications_python_client.authentication import create_jwt_token
 
 from app import db
@@ -24,7 +24,6 @@ from app.dao.api_key_dao import (
 from app.dao.services_dao import dao_fetch_service_by_id
 from tests import (
     create_admin_authorization_header,
-    create_internal_authorization_header,
     create_service_authorization_header,
 )
 from tests.conftest import set_config_values
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index 652f79148..3b5c51ce8 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -35,7 +35,6 @@ from app.models import (
 )
 from tests.app import load_example_csv
 from tests.app.db import create_job, create_notification, create_template
-from tests.conftest import set_config
 
 
 def _create_slow_delivery_notification(template, provider='mmg'):
diff --git a/tests/app/db.py b/tests/app/db.py
index 383a5019e..53c6f43fe 100644
--- a/tests/app/db.py
+++ b/tests/app/db.py
@@ -2,8 +2,6 @@ import random
 import uuid
 from datetime import date, datetime, timedelta
 
-import pytest
-
 from app import db
 from app.dao import fact_processing_time_dao
 from app.dao.email_branding_dao import dao_create_email_branding
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index 2236a4f29..13fe54dbe 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -28,7 +28,6 @@ from app.models import (
     KEY_TYPE_TEST,
     LETTER_TYPE,
     NOTIFICATION_RETURNED_LETTER,
-    SERVICE_PERMISSION_TYPES,
     SMS_TYPE,
     UPLOAD_LETTERS,
     AnnualBilling,
diff --git a/tests/conftest.py b/tests/conftest.py
index 5678bfa3a..dabd3eb33 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -5,7 +5,7 @@ import pytest
 import sqlalchemy
 from alembic.command import upgrade
 from alembic.config import Config
-from flask import Flask, current_app
+from flask import Flask
 
 from app import create_app, db
 from app.dao.provider_details_dao import get_provider_details_by_identifier