diff --git a/app/main/forms.py b/app/main/forms.py
index 65877e997..ecd8af8a8 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -765,6 +765,19 @@ class LetterTemplatePostageForm(StripWhitespaceForm):
     )
 
 
+class LetterUploadPostageForm(StripWhitespaceForm):
+    postage = RadioField(
+        'Choose the postage for this letter',
+        choices=[
+            ('first', 'First class post'),
+            ('second', 'Second class post'),
+        ],
+        default='second',
+        validators=[DataRequired()]
+    )
+    file_id = HiddenField()
+
+
 class ForgotPasswordForm(StripWhitespaceForm):
     email_address = email_address(gov_user=False)
 
diff --git a/app/main/views/uploads.py b/app/main/views/uploads.py
index 665fce5a5..0fd7dbe84 100644
--- a/app/main/views/uploads.py
+++ b/app/main/views/uploads.py
@@ -18,7 +18,7 @@ from requests import RequestException
 from app import current_service, notification_api_client, service_api_client
 from app.extensions import antivirus_client
 from app.main import main
-from app.main.forms import PDFUploadForm
+from app.main.forms import LetterUploadPostageForm, PDFUploadForm
 from app.main.views.jobs import view_jobs
 from app.s3_client.s3_letter_upload_client import (
     get_letter_metadata,
@@ -154,6 +154,8 @@ def uploaded_letter_preview(service_id, file_id):
     error = get_letter_validation_error(error_message, invalid_pages, page_count)
     template_dict = service_api_client.get_precompiled_template(service_id)
 
+    form = LetterUploadPostageForm()
+
     template = get_template(
         template_dict,
         service_id,
@@ -172,6 +174,7 @@ def uploaded_letter_preview(service_id, file_id):
         status=status,
         file_id=file_id,
         error=error,
+        form=form,
     )
 
 
diff --git a/app/templates/views/uploads/preview.html b/app/templates/views/uploads/preview.html
index c448b3b4d..fc74ca0e2 100644
--- a/app/templates/views/uploads/preview.html
+++ b/app/templates/views/uploads/preview.html
@@ -1,6 +1,7 @@
 {% extends "withnav_template.html" %}
 {% from "components/banner.html" import banner_wrapper %}
 {% from "components/page-header.html" import page_header %}
+{% from "components/radios.html" import radios %}
 
 {% block service_page_title %}
   {{ original_filename }}
@@ -39,8 +40,9 @@
           'main.send_uploaded_letter',
           service_id=current_service.id,
         )}}" class='page-footer'>
-        <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
-        <input type="hidden" name="file_id" value="{{ file_id }}" />
+          {{ form.csrf_token }}
+          {{ radios(form.postage, hide_legend=true) }}
+          {{ form.file_id(value=file_id) }}
         <button type="submit" class="button">Send 1 letter</button>
       </form>
     </div>