diff --git a/app/celery/scheduled_tasks.py b/app/celery/scheduled_tasks.py
index 5614c361f..9c4dbb5c5 100644
--- a/app/celery/scheduled_tasks.py
+++ b/app/celery/scheduled_tasks.py
@@ -39,7 +39,7 @@ from app.notifications.process_notifications import send_notification_to_queue
 from app.statsd_decorators import statsd
 from app.celery.tasks import process_job
 from app.config import QueueNames, TaskNames
-from app.utils import convert_utc_to_bst
+from app.utils import convert_utc_to_bst, get_unrestricted_letter_ids
 
 
 @notify_celery.task(name="remove_csv_files")
@@ -308,9 +308,14 @@ def populate_monthly_billing():
 @statsd(namespace="tasks")
 def run_letter_jobs():
     job_ids = dao_get_letter_job_ids_by_status(JOB_STATUS_READY_TO_SEND)
-    notify_celery.send_task(
-        name=TaskNames.DVLA_FILES,
-        args=(job_ids,),
-        queue=QueueNames.PROCESS_FTP
-    )
-    current_app.logger.info("Queued {} ready letter job ids onto {}".format(len(job_ids), QueueNames.PROCESS_FTP))
+
+    unrestricted_job_ids = get_unrestricted_letter_ids(job_ids)
+
+    if unrestricted_job_ids:
+        notify_celery.send_task(
+            name=TaskNames.DVLA_FILES,
+            args=(unrestricted_job_ids,),
+            queue=QueueNames.PROCESS_FTP
+        )
+    current_app.logger.info(
+        "Queued {} ready letter job ids onto {}".format(len(unrestricted_job_ids), QueueNames.PROCESS_FTP))
diff --git a/app/celery/tasks.py b/app/celery/tasks.py
index ed7811ddb..a5e9f98d6 100644
--- a/app/celery/tasks.py
+++ b/app/celery/tasks.py
@@ -75,7 +75,7 @@ def process_job(job_id):
 
     db_template = dao_get_template_by_id(job.template_id, job.template_version)
 
-    if db_template.template_type == LETTER_TYPE and service.restricted:
+    if db_template.template_type == LETTER_TYPE and job.service.restricted:
         job.job_status = JOB_STATUS_ERROR
         dao_update_job(job)
         current_app.logger.warn(
@@ -97,9 +97,9 @@ def process_job(job_id):
             update_job_to_sent_to_dvla.apply_async([str(job.id)], queue=QueueNames.RESEARCH_MODE)
         else:
             build_dvla_file.apply_async([str(job.id)], queue=QueueNames.JOBS)
-        # temporary logging
-        current_app.logger.info("send job {} to build-dvla-file in the {} queue".format(
-            job_id, QueueNames.JOBS if not service.research_mode else QueueNames.RESEARCH_MODE))
+            # temporary logging
+            current_app.logger.info("send job {} to build-dvla-file in the {} queue".format(
+                job_id, QueueNames.JOBS))
     else:
         job.job_status = JOB_STATUS_FINISHED
 
diff --git a/app/letters/rest.py b/app/letters/rest.py
index b9ce7bf35..458611a80 100644
--- a/app/letters/rest.py
+++ b/app/letters/rest.py
@@ -8,6 +8,7 @@ from app.schemas import job_schema
 from app.v2.errors import register_errors
 from app.letters.letter_schemas import letter_job_ids
 from app.schema_validation import validate
+from app.utils import get_unrestricted_letter_ids
 
 letter_job = Blueprint("letter-job", __name__)
 register_errors(letter_job)
@@ -16,7 +17,11 @@ register_errors(letter_job)
 @letter_job.route('/send-letter-jobs', methods=['POST'])
 def send_letter_jobs():
     job_ids = validate(request.get_json(), letter_job_ids)
-    notify_celery.send_task(name=TaskNames.DVLA_FILES, args=(job_ids['job_ids'],), queue=QueueNames.PROCESS_FTP)
+
+    unrestricted_job_ids = get_unrestricted_letter_ids(job_ids['job_ids'])
+
+    notify_celery.send_task(
+        name=TaskNames.DVLA_FILES, args=(unrestricted_job_ids,), queue=QueueNames.PROCESS_FTP)
 
     return jsonify(data={"response": "Task created to send files to DVLA"}), 201
 
diff --git a/app/utils.py b/app/utils.py
index cf4c28f06..538673fb3 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -1,7 +1,7 @@
 from datetime import datetime, timedelta
 
 import pytz
-from flask import url_for
+from flask import current_app, url_for
 from sqlalchemy import func
 from notifications_utils.template import SMSMessageTemplate, PlainTextEmailTemplate, LetterPreviewTemplate
 
@@ -86,3 +86,31 @@ def get_public_notify_type_text(notify_type, plural=False):
         notify_type_text = 'text message'
 
     return '{}{}'.format(notify_type_text, 's' if plural else '')
+
+
+def get_unrestricted_letter_ids(job_ids):
+    from app.dao.jobs_dao import (
+        dao_get_job_by_id,
+        dao_update_job
+    )
+
+    from app.models import (LETTER_TYPE, JOB_STATUS_ERROR)
+    from app.dao.templates_dao import dao_get_template_by_id
+
+    unrestricted_job_ids = []
+
+    for job_id in job_ids:
+        job = dao_get_job_by_id(job_id)
+
+        template = dao_get_template_by_id(job.template_id, job.template_version)
+
+        if template.template_type == LETTER_TYPE:
+            if job.service.restricted:
+                job.job_status = JOB_STATUS_ERROR
+                dao_update_job(job)
+                current_app.logger.warn(
+                    "Job {} has been set to error, service {} is in trial mode".format(job.id, job.service.id))
+            else:
+                unrestricted_job_ids.append(job_id)
+
+    return unrestricted_job_ids
diff --git a/tests/app/celery/test_scheduled_tasks.py b/tests/app/celery/test_scheduled_tasks.py
index 0929291b2..cfcd386dd 100644
--- a/tests/app/celery/test_scheduled_tasks.py
+++ b/tests/app/celery/test_scheduled_tasks.py
@@ -41,7 +41,7 @@ from app.dao.provider_details_dao import (
 from app.models import (
     Service, Template,
     SMS_TYPE, LETTER_TYPE,
-    JOB_STATUS_READY_TO_SEND,
+    JOB_STATUS_READY_TO_SEND, JOB_STATUS_ERROR,
     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
@@ -680,7 +680,9 @@ def test_populate_monthly_billing_updates_correct_month_in_bst(sample_template):
 
 
 def test_run_letter_jobs(client, mocker, sample_letter_template):
-    job_ids = [str(uuid.uuid4()), str(uuid.uuid4())]
+    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)]
+    job_ids = [str(j.id) for j in jobs]
     mocker.patch(
         "app.celery.scheduled_tasks.dao_get_letter_job_ids_by_status",
         return_value=job_ids
@@ -692,3 +694,42 @@ def test_run_letter_jobs(client, mocker, sample_letter_template):
     mock_celery.assert_called_once_with(name=TaskNames.DVLA_FILES,
                                         args=(job_ids,),
                                         queue=QueueNames.PROCESS_FTP)
+
+
+def test_run_letter_jobs_in_trial_sets_job_to_error(client, mocker, sample_letter_template):
+    sample_letter_template.service.restricted = True
+    job = create_job(sample_letter_template)
+    job_ids = [str(job.id)]
+    mocker.patch(
+        "app.celery.scheduled_tasks.dao_get_letter_job_ids_by_status",
+        return_value=job_ids
+    )
+    mock_celery = mocker.patch("app.celery.tasks.notify_celery.send_task")
+
+    run_letter_jobs()
+
+    assert not mock_celery.called
+    assert job.job_status == JOB_STATUS_ERROR
+
+
+def test_run_letter_jobs_in_trial_sets_job_to_error_and_process_live_services(
+        client, mocker, sample_letter_template):
+    live_job = create_job(sample_letter_template)
+
+    service = create_service(service_name="Sample service 2", restricted=True)
+    template = create_template(service, template_type=LETTER_TYPE)
+    trial_job = create_job(template)
+
+    job_ids = [str(live_job.id), str(trial_job.id)]
+    mocker.patch(
+        "app.celery.scheduled_tasks.dao_get_letter_job_ids_by_status",
+        return_value=job_ids
+    )
+    mock_celery = mocker.patch("app.celery.tasks.notify_celery.send_task")
+
+    run_letter_jobs()
+
+    mock_celery.assert_called_once_with(name=TaskNames.DVLA_FILES,
+                                        args=([str(live_job.id)],),
+                                        queue=QueueNames.PROCESS_FTP)
+    assert trial_job.job_status == JOB_STATUS_ERROR
diff --git a/tests/app/letters/test_send_letter_jobs.py b/tests/app/letters/test_send_letter_jobs.py
index d38e24c8f..d899387b6 100644
--- a/tests/app/letters/test_send_letter_jobs.py
+++ b/tests/app/letters/test_send_letter_jobs.py
@@ -5,11 +5,15 @@ from flask import json
 from app.variables import LETTER_TEST_API_FILENAME
 
 from tests import create_authorization_header
+from tests.app.db import create_job
 
 
-def test_send_letter_jobs(client, mocker):
+def test_send_letter_jobs(client, mocker, sample_letter_template):
     mock_celery = mocker.patch("app.letters.rest.notify_celery.send_task")
-    job_ids = {"job_ids": [str(uuid.uuid4()), str(uuid.uuid4()), str(uuid.uuid4())]}
+    job_1 = create_job(sample_letter_template)
+    job_2 = create_job(sample_letter_template)
+    job_3 = create_job(sample_letter_template)
+    job_ids = {"job_ids": [str(job_1.id), str(job_2.id), str(job_3.id)]}
 
     auth_header = create_authorization_header()