diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index f95420f33..e40021d38 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -308,10 +308,10 @@ def populate_monthly_billing():
 @notify_celery.task(name="run-letter-jobs")
 @statsd(namespace="tasks")
 def run_letter_jobs():
-    ids = dao_get_letter_jobs_by_status(JOB_STATUS_READY_TO_SEND)
+    job_ids = [job.id for job in dao_get_letter_jobs_by_status(JOB_STATUS_READY_TO_SEND)]
     notify_celery.send_task(
         name=QueueNames.DVLA_FILES,
-        args=(ids),
+        args=(job_ids),
         queue=QueueNames.PROCESS_FTP
     )
-    current_app.logger.info("Queued {} ready letter job ids onto {}".format(len(ids), QueueNames.PROCESS_FTP))
+    current_app.logger.info("Queued {} ready letter job ids onto {}".format(len(job_ids), QueueNames.PROCESS_FTP))
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index f2720a2cb..4d1be73ae 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -41,6 +41,7 @@ from app.dao.provider_details_dao import (
 from app.models import (
     Service, Template,
     SMS_TYPE, LETTER_TYPE,
+    JOB_STATUS_READY_TO_SEND,
     MonthlyBilling)
 from app.utils import get_london_midnight_in_utc, convert_utc_to_bst
 from tests.app.db import create_notification, create_service, create_template, create_job, create_rate
@@ -683,16 +684,17 @@ def test_populate_monthly_billing_updates_correct_month_in_bst(sample_template):
     assert monthly_billing[1].monthly_totals[0]['total_cost'] == 0.0123
 
 
-def test_run_letter_jobs(client, mocker):
-    job_ids = [str(uuid.uuid4()), str(uuid.uuid4())]
+def test_run_letter_jobs(client, mocker, sample_letter_template):
+    jobs = [create_job(template=sample_letter_template, job_status=JOB_STATUS_READY_TO_SEND),
+            create_job(template=sample_letter_template, job_status=JOB_STATUS_READY_TO_SEND)]
     mocker.patch(
         "app.celery.scheduled_tasks.dao_get_letter_jobs_by_status",
-        return_value=job_ids
+        return_value=jobs
     )
     mock_celery = mocker.patch("app.celery.tasks.notify_celery.send_task")
 
     run_letter_jobs()
 
     mock_celery.assert_called_once_with(name=QueueNames.DVLA_FILES,
-                                        args=(job_ids),
+                                        args=([job.id for job in jobs]),
                                         queue=QueueNames.PROCESS_FTP)
diff --git a/tests/app/dao/test_jobs_dao.py b/tests/app/dao/test_jobs_dao.py
index 72f3ece04..ea09d5c18 100644
--- a/tests/app/dao/test_jobs_dao.py
+++ b/tests/app/dao/test_jobs_dao.py
@@ -34,6 +34,7 @@ from tests.app.conftest import sample_template as create_template
 from tests.app.db import (
     create_user,
     create_job as create_db_job,
+    create_service as create_db_service,
     create_template as create_db_template
 )
 
@@ -551,16 +552,34 @@ def stats_set_up(notify_db, notify_db_session, service):
 
 
 def test_dao_get_letter_jobs_by_status(sample_service):
-    create_db_template(service=sample_service, template_type=SMS_TYPE)
-    create_db_template(service=sample_service, template_type=EMAIL_TYPE)
+    another_service = create_db_service(service_name="another service")
+
+    sms_template = create_db_template(service=sample_service, template_type=SMS_TYPE)
+    email_template = create_db_template(service=sample_service, template_type=EMAIL_TYPE)
     letter_template = create_db_template(service=sample_service, template_type=LETTER_TYPE)
-    jobs = []
-    jobs.append(create_db_job(letter_template, job_status=JOB_STATUS_READY_TO_SEND, original_file_name='1.csv'))
-    jobs.append(create_db_job(letter_template, job_status=JOB_STATUS_READY_TO_SEND, original_file_name='2.csv'))
-    create_db_job(letter_template, job_status=JOB_STATUS_SENT_TO_DVLA, original_file_name='3.csv')
-    create_db_job(letter_template, job_status=JOB_STATUS_FINISHED, original_file_name='4.csv')
-    create_db_job(letter_template, job_status=JOB_STATUS_PENDING, original_file_name='5.csv')
+    another_letter_template = create_db_template(service=another_service, template_type=LETTER_TYPE)
+    ready_letter_jobs = []
+    ready_letter_jobs.append(
+        create_db_job(
+            letter_template,
+            job_status=JOB_STATUS_READY_TO_SEND,
+            original_file_name='1.csv'
+        )
+    )
+    ready_letter_jobs.append(
+        create_db_job(
+            another_letter_template,
+            job_status=JOB_STATUS_READY_TO_SEND,
+            original_file_name='2.csv'
+        )
+    )
+    create_db_job(sms_template, job_status=JOB_STATUS_FINISHED)
+    create_db_job(email_template, job_status=JOB_STATUS_FINISHED)
+    create_db_job(letter_template, job_status=JOB_STATUS_SENT_TO_DVLA)
+    create_db_job(letter_template, job_status=JOB_STATUS_FINISHED)
+    create_db_job(letter_template, job_status=JOB_STATUS_PENDING)
+
     result = dao_get_letter_jobs_by_status(JOB_STATUS_READY_TO_SEND)
 
     assert len(result) == 2
-    assert set(result) == set(jobs)
+    assert set(result) == set(ready_letter_jobs)