diff --git a/app/main/views/index.py b/app/main/views/index.py
index 8eb1b6584..7f21ac340 100644
--- a/app/main/views/index.py
+++ b/app/main/views/index.py
@@ -17,7 +17,11 @@ from app.main import main
 from app.main.forms import FieldWithNoneOption, SearchByNameForm
 from app.main.views.feedback import QUESTION_TICKET_TYPE
 from app.main.views.sub_navigation_dictionaries import features_nav, pricing_nav
-from app.utils import get_logo_cdn_domain, user_is_logged_in
+from app.utils import (
+    LETTER_SPECIFICATION_URL,
+    get_logo_cdn_domain,
+    user_is_logged_in,
+)
 
 
 @main.route('/')
@@ -269,6 +273,7 @@ def features_sms():
 def features_letters():
     return render_template(
         'views/features/letters.html',
+        letter_specification_url=LETTER_SPECIFICATION_URL,
         navigation_links=features_nav()
     )
 
diff --git a/app/main/views/uploads.py b/app/main/views/uploads.py
index fcbd64ef0..a403e76cc 100644
--- a/app/main/views/uploads.py
+++ b/app/main/views/uploads.py
@@ -33,6 +33,7 @@ from app.s3_client.s3_letter_upload_client import (
 )
 from app.template_previews import TemplatePreview, sanitise_letter
 from app.utils import (
+    LETTER_SPECIFICATION_URL,
     generate_next_dict,
     generate_previous_dict,
     get_letter_validation_error,
@@ -65,6 +66,7 @@ def uploads(service_id):
         prev_page=prev_page,
         next_page=next_page,
         scheduled_jobs='',
+        letter_specification_url=LETTER_SPECIFICATION_URL,
     )
 
 
diff --git a/app/templates/views/features/letters.html b/app/templates/views/features/letters.html
index 6c5a40c2b..12bd5112f 100644
--- a/app/templates/views/features/letters.html
+++ b/app/templates/views/features/letters.html
@@ -33,7 +33,7 @@
 
   <h3 class="heading heading-small" id="upload-letters">Upload your own letters</h3>
   <p>You can create reusable letter templates in Notify, or upload and send your own letters with the Notify API.</p>
-  <p>Use the <a href="https://docs.notifications.service.gov.uk/documentation/images/notify-pdf-letter-spec-v2.4.pdf">letter specification document</a> to help you set up your letter, save it as a PDF, then upload it to Notify.<p>
+  <p>Use the <a href="{{ letter_specification_url }}">letter specification document</a> to help you set up your letter, save it as a PDF, then upload it to Notify.<p>
   <p>Read our <a href="{{ url_for('.documentation') }}">API documentation</a> for more information.</p>
 
   <h2 class="heading heading-medium">Pricing</h2>
diff --git a/app/templates/views/uploads/choose-file.html b/app/templates/views/uploads/choose-file.html
index 855134988..0593157e8 100644
--- a/app/templates/views/uploads/choose-file.html
+++ b/app/templates/views/uploads/choose-file.html
@@ -33,7 +33,7 @@
     )}}
   </p>
   <p>You can upload a single letter as a PDF.</p>
-  <p>Your file must meet our <a href="https://docs.notifications.service.gov.uk/documentation/images/notify-pdf-letter-spec-v2.4.pdf">letter specification</a>.</p>
+  <p>Your file must meet our <a href="{{ letter_specification_url }}">letter specification</a>.</p>
   <p>To help you set up your letter you can download a <a href="https://docs.notifications.service.gov.uk/documentation/images/notify-pdf-letter-word-template-v1.0.docx">Word document template</a>.</p>
 
   </div>
diff --git a/app/utils.py b/app/utils.py
index bacce22b8..171734519 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -566,21 +566,25 @@ def get_letter_printing_statement(status, created_at):
         return 'Printed on {} at 5:30pm'.format(printed_date)
 
 
+LETTER_SPECIFICATION_URL = (
+    'https://docs.notifications.service.gov.uk'
+    '/documentation/images/notify-pdf-letter-spec-v2.4.pdf'
+)
+
+
 LETTER_VALIDATION_MESSAGES = {
     'letter-not-a4-portrait-oriented': {
         'title': 'Your letter is not A4 portrait size',
         'detail': (
             'You need to change the size or orientation of {invalid_pages}. <br>'
-            'Files must meet our <a href="https://docs.notifications.service.gov.uk/documentation/images/'
-            'notify-pdf-letter-spec-v2.4.pdf" target="_blank">letter specification</a>.'
+            f'Files must meet our <a href="{LETTER_SPECIFICATION_URL}" target="_blank">letter specification</a>.'
         ),
     },
     'content-outside-printable-area': {
         'title': 'Your content is outside the printable area',
         'detail': (
             'You need to edit {invalid_pages}.<br>'
-            'Files must meet our <a href="https://docs.notifications.service.gov.uk/documentation/images/'
-            'notify-pdf-letter-spec-v2.4.pdf" target="_blank">letter specification</a>.'
+            f'Files must meet our <a href="{LETTER_SPECIFICATION_URL}" target="_blank">letter specification</a>.'
         ),
     },
     'letter-too-long': {
@@ -604,8 +608,7 @@ LETTER_VALIDATION_MESSAGES = {
         'title': 'The address block is empty',
         'detail': (
             'You need to add a recipient address.<br>'
-            'Files must meet our <a href="https://docs.notifications.service.gov.uk/documentation/images/'
-            'notify-pdf-letter-spec-v2.4.pdf" target="_blank">letter specification</a>.'
+            f'Files must meet our <a href="{LETTER_SPECIFICATION_URL}" target="_blank">letter specification</a>.'
         ),
     }
 }