diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index 002220798..422eb6d4d 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -5,6 +5,7 @@ from datetime import (
 
 from celery.signals import worker_process_shutdown
 from flask import current_app
+from sqlalchemy import or_, and_
 from sqlalchemy.exc import SQLAlchemyError
 from notifications_utils.s3 import s3upload
 
@@ -18,8 +19,8 @@ from app.dao.invited_user_dao import delete_invitations_created_more_than_two_da
 from app.dao.jobs_dao import (
     dao_get_letter_job_ids_by_status,
     dao_set_scheduled_jobs_to_pending,
-    dao_get_jobs_older_than_limited_by
-)
+    dao_get_jobs_older_than_limited_by,
+    dao_get_job_by_id)
 from app.dao.monthly_billing_dao import (
     get_service_ids_that_need_billing_populated,
     create_or_update_monthly_billing
@@ -38,12 +39,14 @@ from app.dao.provider_details_dao import (
     dao_toggle_sms_provider
 )
 from app.dao.users_dao import delete_codes_older_created_more_than_a_day_ago
-from app.models import LETTER_TYPE, JOB_STATUS_READY_TO_SEND
+from app.models import LETTER_TYPE, JOB_STATUS_READY_TO_SEND, JOB_STATUS_SENT_TO_DVLA, JOB_STATUS_FINISHED, Job, \
+    EMAIL_TYPE, SMS_TYPE, JOB_STATUS_IN_PROGRESS
 from app.notifications.process_notifications import send_notification_to_queue
 from app.statsd_decorators import statsd
 from app.celery.tasks import process_job, create_dvla_file_contents_for_notifications
 from app.config import QueueNames, TaskNames
 from app.utils import convert_utc_to_bst
+from app.v2.errors import JobIncompleteError
 
 
 @worker_process_shutdown.connect
@@ -360,3 +363,30 @@ def run_letter_api_notifications():
                 QueueNames.PROCESS_FTP
             )
         )
+
+
+@notify_celery.task(name='check-job-status')
+@statsd(namespace="tasks")
+def check_job_status():
+    """
+    every x minutes do this check
+    select
+    from jobs
+    where job_status == 'in progress'
+    and template_type in ('sms', 'email')
+    and scheduled_at or created_at is older that 30 minutes.
+    if any results then
+        raise error
+        process the rows in the csv that are missing (in another task) just do the check here.
+    """
+    thirty_minutes_ago = datetime.utcnow() - timedelta(minutes=30)
+    thirty_five_minutes_ago = datetime.utcnow() - timedelta(minutes=35)
+
+    jobs_not_complete_after_30_minutes = Job.query.filter(
+        Job.job_status == JOB_STATUS_IN_PROGRESS,
+        and_(thirty_five_minutes_ago < Job.processing_started, Job.processing_started < thirty_minutes_ago)
+    ).all()
+
+    job_ids = [str(x.id) for x in jobs_not_complete_after_30_minutes]
+    if job_ids:
+        raise JobIncompleteError("Job(s) {} have not completed.".format(job_ids))
diff --git a/app/celery/tasks.py b/app/celery/tasks.py
index e4b00576e..45aa480dd 100644
--- a/app/celery/tasks.py
+++ b/app/celery/tasks.py
@@ -1,5 +1,5 @@
 import json
-from datetime import (datetime)
+from datetime import datetime
 from collections import namedtuple
 
 from celery.signals import worker_process_init, worker_process_shutdown
@@ -7,9 +7,15 @@ from flask import current_app
 from notifications_utils.recipients import (
     RecipientCSV
 )
-from notifications_utils.template import SMSMessageTemplate, WithSubjectTemplate, LetterDVLATemplate
-from requests import HTTPError
-from requests import request
+from notifications_utils.template import (
+    SMSMessageTemplate,
+    WithSubjectTemplate,
+    LetterDVLATemplate
+)
+from requests import (
+    HTTPError,
+    request
+)
 from sqlalchemy.exc import SQLAlchemyError
 from app import (
     create_uuid,
@@ -84,6 +90,7 @@ def process_job(job_id):
         return
 
     job.job_status = JOB_STATUS_IN_PROGRESS
+    job.processing_started = start
     dao_update_job(job)
 
     db_template = dao_get_template_by_id(job.template_id, job.template_version)
@@ -91,6 +98,8 @@ def process_job(job_id):
     TemplateClass = get_template_class(db_template.template_type)
     template = TemplateClass(db_template.__dict__)
 
+    current_app.logger.info("Starting job {} processing {} notifications".format(job_id, job.notification_count))
+
     for row_number, recipient, personalisation in RecipientCSV(
             s3.get_job_from_s3(str(service.id), str(job_id)),
             template_type=template.template_type,
@@ -108,7 +117,6 @@ def process_job(job_id):
         job.job_status = JOB_STATUS_FINISHED
 
     finished = datetime.utcnow()
-    job.processing_started = start
     job.processing_finished = finished
     dao_update_job(job)
     current_app.logger.info(
diff --git a/app/config.py b/app/config.py
index 9e7410471..cd9e3cda9 100644
--- a/app/config.py
+++ b/app/config.py
@@ -234,6 +234,11 @@ class Config(object):
             'task': 'run-letter-api-notifications',
             'schedule': crontab(hour=17, minute=40),
             'options': {'queue': QueueNames.PERIODIC}
+        },
+        'check-job-status': {
+            'task': 'check-job-status',
+            'schedule': crontab(),
+            'options': {'queue': QueueNames.PERIODIC}
         }
     }
     CELERY_QUEUES = []
diff --git a/app/v2/errors.py b/app/v2/errors.py
index 0fa6bddac..cefdeef87 100644
--- a/app/v2/errors.py
+++ b/app/v2/errors.py
@@ -7,6 +7,23 @@ from app.authentication.auth import AuthError
 from app.errors import InvalidRequest
 
 
+class JobIncompleteError(Exception):
+    def __init__(self, message):
+        self.message = message
+        self.status_code = 500
+
+    def to_dict_v2(self):
+        return {
+            'status_code': self.status_code,
+            "errors": [
+                {
+                    "error": 'JobIncompleteError',
+                    "message": self.message
+                }
+            ]
+        }
+
+
 class TooManyRequestsError(InvalidRequest):
     status_code = 429
     message_template = 'Exceeded send limits ({}) for today'
@@ -49,6 +66,10 @@ def register_errors(blueprint):
         current_app.logger.exception(error)
         return jsonify(json.loads(error.message)), 400
 
+    @blueprint.errorhandler(JobIncompleteError)
+    def job_incomplete_error(error):
+        return jsonify(error.to_dict_v2()), 500
+
     @blueprint.errorhandler(NoResultFound)
     @blueprint.errorhandler(DataError)
     def no_result_found(e):
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index 9d770888b..4c69f7ba8 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -29,7 +29,7 @@ from app.celery.scheduled_tasks import (
     timeout_job_statistics,
     timeout_notifications,
     populate_monthly_billing,
-    send_total_sent_notifications_to_performance_platform)
+    send_total_sent_notifications_to_performance_platform, check_job_status)
 from app.clients.performance_platform.performance_platform_client import PerformancePlatformClient
 from app.config import QueueNames, TaskNames
 from app.dao.jobs_dao import dao_get_job_by_id
@@ -47,8 +47,9 @@ from app.models import (
     NOTIFICATION_PENDING,
     NOTIFICATION_CREATED,
     KEY_TYPE_TEST,
-    MonthlyBilling)
+    MonthlyBilling, JOB_STATUS_FINISHED)
 from app.utils import get_london_midnight_in_utc
+from app.v2.errors import JobIncompleteError
 from tests.app.db import create_notification, create_service, create_template, create_job, create_rate
 from tests.app.conftest import (
     sample_job as create_sample_job,
@@ -743,7 +744,6 @@ def test_run_letter_api_notifications_triggers_ftp_task(client, mocker, sample_l
 
 
 def test_run_letter_api_notifications_does_nothing_if_no_created_notifications(
-    client,
     mocker,
     sample_letter_template,
     sample_letter_job,
@@ -753,7 +753,7 @@ def test_run_letter_api_notifications_does_nothing_if_no_created_notifications(
         sample_letter_template,
         job=sample_letter_job
     )
-    pending_letter_notification = create_notification(
+    create_notification(
         sample_letter_template,
         status=NOTIFICATION_PENDING,
         api_key=sample_api_key
@@ -770,3 +770,55 @@ def test_run_letter_api_notifications_does_nothing_if_no_created_notifications(
     assert not mock_celery.called
     assert letter_job_notification.status == NOTIFICATION_CREATED
     assert test_api_key_notification.status == NOTIFICATION_CREATED
+
+
+def test_check_job_status_task_raises_job_incomplete_error(sample_template):
+    job = create_job(template=sample_template, notification_count=3,
+                     created_at=datetime.utcnow() - timedelta(minutes=31),
+                     processing_started=datetime.utcnow() - timedelta(minutes=31),
+                     job_status=JOB_STATUS_IN_PROGRESS)
+    create_notification(template=sample_template, job=job)
+    with pytest.raises(expected_exception=JobIncompleteError) as e:
+        check_job_status()
+    assert e.value.message == "Job(s) ['{}'] have not completed.".format(str(job.id))
+
+
+def test_check_job_status_task_raises_job_incomplete_error_when_scheduled_job_is_not_complete(sample_template):
+    job = create_job(template=sample_template, notification_count=3,
+                     created_at=datetime.utcnow() - timedelta(hours=2),
+                     scheduled_for=datetime.utcnow() - timedelta(minutes=31),
+                     processing_started=datetime.utcnow() - timedelta(minutes=31),
+                     job_status=JOB_STATUS_IN_PROGRESS)
+    with pytest.raises(expected_exception=JobIncompleteError) as e:
+        check_job_status()
+    assert e.value.message == "Job(s) ['{}'] have not completed.".format(str(job.id))
+
+
+def test_check_job_status_task_raises_job_incomplete_error_for_multiple_jobs(sample_template):
+    job = create_job(template=sample_template, notification_count=3,
+                     created_at=datetime.utcnow() - timedelta(hours=2),
+                     scheduled_for=datetime.utcnow() - timedelta(minutes=31),
+                     processing_started=datetime.utcnow() - timedelta(minutes=31),
+                     job_status=JOB_STATUS_IN_PROGRESS)
+    job_2 = create_job(template=sample_template, notification_count=3,
+                       created_at=datetime.utcnow() - timedelta(hours=2),
+                       scheduled_for=datetime.utcnow() - timedelta(minutes=31),
+                       processing_started=datetime.utcnow() - timedelta(minutes=31),
+                       job_status=JOB_STATUS_IN_PROGRESS)
+    with pytest.raises(expected_exception=JobIncompleteError) as e:
+        check_job_status()
+    assert str(job.id) in e.value.message
+    assert str(job_2.id) in e.value.message
+
+
+def test_check_job_status_task_does_not_raise_error(sample_template):
+    job = create_job(template=sample_template, notification_count=3,
+                     created_at=datetime.utcnow() - timedelta(hours=2),
+                     scheduled_for=datetime.utcnow() - timedelta(minutes=31),
+                     processing_started=datetime.utcnow() - timedelta(minutes=31),
+                     job_status=JOB_STATUS_FINISHED)
+    job_2 = create_job(template=sample_template, notification_count=3,
+                       created_at=datetime.utcnow() - timedelta(minutes=31),
+                       processing_started=datetime.utcnow() - timedelta(minutes=31),
+                       job_status=JOB_STATUS_FINISHED)
+    check_job_status()
diff --git a/tests/app/celery/test_tasks.py b/tests/app/celery/test_tasks.py
index 574ed2eb7..980622680 100644
--- a/tests/app/celery/test_tasks.py
+++ b/tests/app/celery/test_tasks.py
@@ -17,7 +17,6 @@ from app.celery.tasks import (
     s3,
     build_dvla_file,
     create_dvla_file_contents_for_job,
-    update_dvla_job_to_error,
     process_job,
     process_row,
     send_sms,
@@ -29,7 +28,6 @@ from app.config import QueueNames
 from app.dao import jobs_dao, services_dao
 from app.models import (
     EMAIL_TYPE,
-    JOB_STATUS_ERROR,
     KEY_TYPE_NORMAL,
     KEY_TYPE_TEAM,
     KEY_TYPE_TEST,
diff --git a/tests/app/dao/notification_dao/test_notification_dao.py b/tests/app/dao/notification_dao/test_notification_dao.py
index 3124b3a13..5ec851edc 100644
--- a/tests/app/dao/notification_dao/test_notification_dao.py
+++ b/tests/app/dao/notification_dao/test_notification_dao.py
@@ -52,7 +52,12 @@ from app.dao.notifications_dao import (
 )
 
 from app.dao.services_dao import dao_update_service
-from tests.app.db import create_notification, create_api_key, create_reply_to_email
+from tests.app.db import (
+    create_api_key,
+    create_job,
+    create_notification,
+    create_reply_to_email
+)
 from tests.app.conftest import (
     sample_notification,
     sample_template,
diff --git a/tests/app/v2/test_errors.py b/tests/app/v2/test_errors.py
index 8345faacc..f08367f81 100644
--- a/tests/app/v2/test_errors.py
+++ b/tests/app/v2/test_errors.py
@@ -9,7 +9,7 @@ def app_for_test(mocker):
     import flask
     from flask import Blueprint
     from app.authentication.auth import AuthError
-    from app.v2.errors import BadRequestError, TooManyRequestsError
+    from app.v2.errors import BadRequestError, TooManyRequestsError, JobIncompleteError
 
     app = flask.Flask(__name__)
     app.config['TESTING'] = True
@@ -39,6 +39,10 @@ def app_for_test(mocker):
     def raising_data_error():
         raise DataError("There was a db problem", "params", "orig")
 
+    @blue.route("raise_job_incomplete_error", methods=["GET"])
+    def raising_job_incomplete_error():
+        raise JobIncompleteError("Raising job incomplete error")
+
     @blue.route("raise_exception", methods=["GET"])
     def raising_exception():
         raise AssertionError("Raising any old exception")
@@ -107,6 +111,16 @@ def test_data_errors(app_for_test):
                              "errors": [{"error": "DataError", "message": "No result found"}]}
 
 
+def test_job_incomplete_errors(app_for_test):
+    with app_for_test.test_request_context():
+        with app_for_test.test_client() as client:
+            response = client.get(url_for('v2_under_test.raising_job_incomplete_error'))
+            assert response.status_code == 500
+            error = json.loads(response.get_data(as_text=True))
+            assert error == {"status_code": 500,
+                             "errors": [{"error": "JobIncompleteError", "message": "Raising job incomplete error"}]}
+
+
 def test_internal_server_error_handler(app_for_test):
     with app_for_test.test_request_context():
         with app_for_test.test_client() as client: