diff --git a/app/celery/letters_pdf_tasks.py b/app/celery/letters_pdf_tasks.py
index 9149b72cc..409ed7808 100644
--- a/app/celery/letters_pdf_tasks.py
+++ b/app/celery/letters_pdf_tasks.py
@@ -119,17 +119,22 @@ def collate_letter_pdfs_for_day(date=None):
         current_app.config['LETTERS_PDF_BUCKET_NAME'],
         subfolder=date
     )
-    for letters in group_letters(letter_pdfs):
+    for i, letters in enumerate(group_letters(letter_pdfs)):
+        dvla_filename = 'NOTIFY.{date}{num:06}.ZIP'.format(date=date.replace('-', ''), num=i + 1)
         filenames = [letter['Key'] for letter in letters]
         current_app.logger.info(
-            'Calling task zip-and-send-letter-pdfs for {} pdfs of total size {:,} bytes'.format(
+            'Calling task zip-and-send-letter-pdfs for {} pdfs to upload {} with total size {:,} bytes'.format(
                 len(filenames),
+                dvla_filename,
                 sum(letter['Size'] for letter in letters)
             )
         )
         notify_celery.send_task(
             name=TaskNames.ZIP_AND_SEND_LETTER_PDFS,
-            kwargs={'filenames_to_zip': filenames},
+            kwargs={
+                'filenames_to_zip': filenames,
+                'upload_filename': dvla_filename
+            },
             queue=QueueNames.PROCESS_FTP,
             compression='zlib'
         )
diff --git a/tests/app/celery/test_letters_pdf_tasks.py b/tests/app/celery/test_letters_pdf_tasks.py
index 4a849a005..d35301ae5 100644
--- a/tests/app/celery/test_letters_pdf_tasks.py
+++ b/tests/app/celery/test_letters_pdf_tasks.py
@@ -231,13 +231,13 @@ def test_collate_letter_pdfs_for_day(notify_api, mocker):
     mock_group_letters.assert_called_once_with(mock_s3.return_value)
     assert mock_celery.call_args_list[0] == call(
         name='zip-and-send-letter-pdfs',
-        kwargs={'filenames_to_zip': ['A.PDF', 'B.pDf']},
+        kwargs={'filenames_to_zip': ['A.PDF', 'B.pDf'], 'upload_filename': 'NOTIFY.20170102000001.ZIP'},
         queue='process-ftp-tasks',
         compression='zlib'
     )
     assert mock_celery.call_args_list[1] == call(
         name='zip-and-send-letter-pdfs',
-        kwargs={'filenames_to_zip': ['C.pdf']},
+        kwargs={'filenames_to_zip': ['C.pdf'], 'upload_filename': 'NOTIFY.20170102000002.ZIP'},
         queue='process-ftp-tasks',
         compression='zlib'
     )