diff --git a/app/assets/javascripts/preventDuplicateFormSubmissions.js b/app/assets/javascripts/preventDuplicateFormSubmissions.js
new file mode 100644
index 000000000..0eca28039
--- /dev/null
+++ b/app/assets/javascripts/preventDuplicateFormSubmissions.js
@@ -0,0 +1,30 @@
+(function() {
+
+  "use strict";
+
+  let disableSubmitButtons = function(event) {
+
+    $submitButton = $(this).find(':submit');
+
+    if ($submitButton.data('clicked') == 'true') {
+
+      event.preventDefault();
+
+    } else {
+
+      $submitButton.data('clicked', 'true');
+      setTimeout(renableSubmitButton($submitButton), 1500);
+
+    }
+
+  };
+
+  let renableSubmitButton = $submitButton => () => {
+
+    $submitButton.data('clicked', '');
+
+  };
+
+  $('form').on('submit', disableSubmitButtons);
+
+})();
diff --git a/app/assets/stylesheets/app.scss b/app/assets/stylesheets/app.scss
index 1e9d32b95..c3a1ba93b 100644
--- a/app/assets/stylesheets/app.scss
+++ b/app/assets/stylesheets/app.scss
@@ -180,6 +180,7 @@ details summary {
     th,
     td {
       @include core-19;
+      word-wrap: break-word;
     }
 
     thead {
diff --git a/app/main/views/send.py b/app/main/views/send.py
index 870fdcb48..757f8cbe0 100644
--- a/app/main/views/send.py
+++ b/app/main/views/send.py
@@ -459,15 +459,17 @@ def check_messages(service_id, template_type, upload_id):
         data['recipients'].too_many_rows or
         not data['count_of_recipients'] or
         not data['recipients'].has_recipient_columns or
-        data['recipients'].missing_column_headers or
-        data['trying_to_send_letters_in_trial_mode']
+        data['recipients'].missing_column_headers
     ):
         return render_template('views/check/column-errors.html', **data)
 
     if data['row_errors']:
         return render_template('views/check/row-errors.html', **data)
 
-    if data['errors']:
+    if (
+        data['errors'] or
+        data['trying_to_send_letters_in_trial_mode']
+    ):
         return render_template('views/check/column-errors.html', **data)
 
     return render_template('views/check/ok.html', **data)
diff --git a/app/templates/views/manage-users.html b/app/templates/views/manage-users.html
index fb79b3b8a..373c5b3a6 100644
--- a/app/templates/views/manage-users.html
+++ b/app/templates/views/manage-users.html
@@ -53,7 +53,7 @@
             ) }}
             {{ tick_cross(
               user.has_permissions(permissions=['manage_templates']),
-              'Manage templates'
+              'Add and edit templates'
             ) }}
             {{ tick_cross(
               user.has_permissions(permissions=['manage_users', 'manage_settings']),
@@ -94,7 +94,7 @@
               ) }}
               {{ tick_cross(
                 user.has_permissions(permissions=['manage_templates']),
-                'Edit templates'
+                'Add and edit templates'
               ) }}
               {{ tick_cross(
                 user.has_permissions(permissions=['manage_users', 'manage_settings']),
diff --git a/gulpfile.babel.js b/gulpfile.babel.js
index 26dd6c96b..9ecc9c15d 100644
--- a/gulpfile.babel.js
+++ b/gulpfile.babel.js
@@ -67,6 +67,7 @@ gulp.task('javascripts', () => gulp
     paths.src + 'javascripts/listEntry.js',
     paths.src + 'javascripts/liveSearch.js',
     paths.src + 'javascripts/errorTracking.js',
+    paths.src + 'javascripts/preventDuplicateFormSubmissions.js',
     paths.src + 'javascripts/main.js'
   ])
   .pipe(plugins.prettyerror())
diff --git a/requirements.txt b/requirements.txt
index 0b1bd52a6..25d4a1360 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,21 +1,18 @@
 ago==0.0.9
-cffi==1.10.0
+cffi==1.11.0
 Flask==0.12.2
 Flask-Script==2.0.5
 Flask-WTF==0.14.2
 Flask-Login==0.4.0
 
 boto3==1.4.7
-py-gfm==0.1.3
 blinker==1.4
-lxml==3.8.0
 pyexcel==0.5.3
 pyexcel-io==0.5.1
 pyexcel-xls==0.5.0
 pyexcel-xlsx==0.5.0.1
 pyexcel-ods3==0.5.0
 pytz==2017.2
-six==1.10.0
 gunicorn==19.7.1
 whitenoise==3.3.0  #manages static assets
 
diff --git a/requirements_for_test.txt b/requirements_for_test.txt
index 9abf5197e..ea72849ef 100644
--- a/requirements_for_test.txt
+++ b/requirements_for_test.txt
@@ -1,7 +1,7 @@
 -r requirements.txt
 pycodestyle==2.3.1
 pytest==3.2.2
-pytest-mock==1.6.2
+pytest-mock==1.6.3
 pytest-cov==2.5.1
 pytest-xdist==1.20.0
 coveralls==1.2.0
diff --git a/tests/app/main/views/test_manage_users.py b/tests/app/main/views/test_manage_users.py
index ce97036f0..2766cd032 100644
--- a/tests/app/main/views/test_manage_users.py
+++ b/tests/app/main/views/test_manage_users.py
@@ -19,21 +19,21 @@ from tests.conftest import (
         active_user_with_permissions,
         (
             'Test User (you) '
-            'Can Send messages Can Manage templates Can Manage service Can Access API keys'
+            'Can Send messages Can Add and edit templates Can Manage service Can Access API keys'
         ),
     ),
     (
         active_user_view_permissions,
         (
             'Test User With Permissions (you) '
-            'Can’t Send messages Can’t Manage templates Can’t Manage service Can’t Access API keys'
+            'Can’t Send messages Can’t Add and edit templates Can’t Manage service Can’t Access API keys'
         ),
     ),
     (
         active_user_manage_template_permission,
         (
             'Test User With Permissions (you) '
-            'Can’t Send messages Can Manage templates Can’t Manage service Can’t Access API keys'
+            'Can’t Send messages Can Add and edit templates Can’t Manage service Can’t Access API keys'
         ),
     ),
 ])
@@ -255,7 +255,7 @@ def test_manage_users_shows_invited_user(
     assert page.h1.string.strip() == 'Team members'
     assert normalize_spaces(page.select('.user-list')[1].text) == (
         'invited_user@test.gov.uk '
-        'Can’t Send messages Can’t Edit templates Can’t Manage service Can Access API keys '
+        'Can’t Send messages Can’t Add and edit templates Can’t Manage service Can Access API keys '
         'Cancel invitation'
     )
 
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index d80548416..45e6b4b44 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -1631,6 +1631,38 @@ def test_check_messages_shows_trial_mode_error_for_letters(
         assert not error
 
 
+def test_check_messages_shows_data_errors_before_trial_mode_errors_for_letters(
+    mocker,
+    client_request,
+    mock_get_service_letter_template,
+    mock_has_permissions,
+    mock_get_users_by_service,
+    mock_get_detailed_service_for_today,
+):
+
+    mocker.patch('app.main.views.send.s3download', return_value='\n'.join(
+        ['address_line_1,address_line_2,postcode,'] +
+        ['              ,              ,11SW1 1AA']
+    ))
+
+    with client_request.session_transaction() as session:
+        session['upload_data'] = {'template_id': '', 'original_file_name': 'example.xlsx'}
+
+    page = client_request.get(
+        'main.check_messages',
+        service_id=SERVICE_ONE_ID,
+        template_type='letter',
+        upload_id=uuid.uuid4(),
+        _test_page_title=False,
+    )
+
+    assert normalize_spaces(page.select_one('.banner-dangerous').text) == (
+        'There is a problem with example.xlsx '
+        'You need to enter missing data in 1 row '
+        'Skip to file contents'
+    )
+
+
 def test_generate_test_letter_doesnt_block_in_trial_mode(
     client_request,
     mocker,