diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index c773fe739..5bac860a6 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -357,9 +357,9 @@ def run_letter_jobs():
         current_app.logger.info("Queued {} ready letter job ids onto {}".format(len(job_ids), QueueNames.PROCESS_FTP))
 
 
-@notify_celery.task(name="run-letter-pdfs")
+@notify_celery.task(name="trigger-letter-pdfs-for-day")
 @statsd(namespace="tasks")
-def run_letter_pdfs():
+def trigger_letter_pdfs_for_day():
     letter_pdfs_count = dao_get_count_of_letters_to_process_for_date()
     if letter_pdfs_count:
         notify_celery.send_task(
diff --git a/app/config.py b/app/config.py
index f92355352..295adab1c 100644
--- a/app/config.py
+++ b/app/config.py
@@ -240,8 +240,8 @@ class Config(object):
             'schedule': crontab(hour=17, minute=30),
             'options': {'queue': QueueNames.PERIODIC}
         },
-        'run-letter-pdfs': {
-            'task': 'run-letter-pdfs',
+        'trigger-letter-pdfs-for-day': {
+            'task': 'trigger-letter-pdfs-for-day',
             'schedule': crontab(hour=17, minute=50),
             'options': {'queue': QueueNames.PERIODIC}
         },
diff --git a/app/dao/notifications_dao.py b/app/dao/notifications_dao.py
index fc6d2b32e..0d1c6e72a 100644
--- a/app/dao/notifications_dao.py
+++ b/app/dao/notifications_dao.py
@@ -586,7 +586,7 @@ def dao_get_last_notification_added_for_job_id(job_id):
     return last_notification_added
 
 
-def dao_get_count_of_letters_to_process_for_date(date_to_process=date.today()):
+def dao_get_count_of_letters_to_process_for_date(date_to_process=None):
     """
     Returns a count of letter notifications for services with letters_as_pdf permission set
     to be processed today if no argument passed in otherwise will return the count for
@@ -595,6 +595,9 @@ def dao_get_count_of_letters_to_process_for_date(date_to_process=date.today()):
 
     Note - services without letters_as_pdf permission will be ignored
     """
+    if date_to_process is None:
+        date_to_process = date.today()
+
     day_before = date_to_process - timedelta(days=1)
     letter_deadline_time = current_app.config.get('LETTER_PROCESSING_DEADLINE')
 
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index 33909e4c4..699f1fa9e 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -24,7 +24,7 @@ from app.celery.scheduled_tasks import (
     remove_transformed_dvla_files,
     run_scheduled_jobs,
     run_letter_jobs,
-    run_letter_pdfs,
+    trigger_letter_pdfs_for_day,
     run_letter_api_notifications,
     populate_monthly_billing,
     s3,
@@ -716,7 +716,7 @@ def test_run_letter_jobs(client, mocker, sample_letter_template):
 
 
 @freeze_time("2017-12-18 17:50")
-def test_run_letter_pdfs(client, mocker, sample_letter_template):
+def test_trigger_letter_pdfs_for_day(client, mocker, sample_letter_template):
     dao_add_service_permission(sample_letter_template.service.id, 'letters_as_pdf')
 
     create_notification(template=sample_letter_template, created_at='2017-12-17 17:30:00')
@@ -724,7 +724,7 @@ def test_run_letter_pdfs(client, mocker, sample_letter_template):
 
     mock_celery = mocker.patch("app.celery.tasks.notify_celery.send_task")
 
-    run_letter_pdfs()
+    trigger_letter_pdfs_for_day()
 
     mock_celery.assert_called_once_with(name='collate-letter-pdfs-for-day',
                                         args=('2017-12-18',),
@@ -732,14 +732,15 @@ def test_run_letter_pdfs(client, mocker, sample_letter_template):
 
 
 @freeze_time("2017-12-18 17:50")
-def test_run_letter_pdfs_send_task_not_called_if_no_notis_for_day(client, mocker, sample_letter_template):
+def test_trigger_letter_pdfs_for_day_send_task_not_called_if_no_notis_for_day(
+        client, mocker, sample_letter_template):
     dao_add_service_permission(sample_letter_template.service.id, 'letters_as_pdf')
 
     create_notification(template=sample_letter_template, created_at='2017-12-15 17:30:00')
 
     mock_celery = mocker.patch("app.celery.tasks.notify_celery.send_task")
 
-    run_letter_pdfs()
+    trigger_letter_pdfs_for_day()
 
     assert not mock_celery.called