diff --git a/app/main/forms.py b/app/main/forms.py
index 985f50bc6..f6f2716f3 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -993,7 +993,7 @@ class ChooseBroadcastDurationForm(StripWhitespaceForm):
         )
 
     finishes_at = RadioField(
-        'When should this broadcast end?',
+        'End time',
     )
 
 
diff --git a/app/templates/components/radios.html b/app/templates/components/radios.html
index 477f0135c..2b3aa0a02 100644
--- a/app/templates/components/radios.html
+++ b/app/templates/components/radios.html
@@ -24,11 +24,12 @@
  field,
  hint=None,
  wrapping_class='form-group',
- show_now_as_default=True
+ show_now_as_default=True,
+ bold_legend=False
 ) %}
  <div class="{{ wrapping_class }} {% if field.errors %} form-group-error{% endif %}">
    <fieldset>
-     <legend class="form-label">
+     <legend class="form-label {% if bold_legend %}govuk-!-font-weight-bold{% endif %}">
        {{ field.label.text }}
        {% if field.errors %}
          <span class="error-message" data-module="track-error" data-error-type="{{ field.errors[0] }}" data-error-label="{{ field.name }}">
diff --git a/app/templates/views/broadcast/preview-message.html b/app/templates/views/broadcast/preview-message.html
index 8fa7a771c..70a196078 100644
--- a/app/templates/views/broadcast/preview-message.html
+++ b/app/templates/views/broadcast/preview-message.html
@@ -29,9 +29,16 @@
   {{ broadcast_message.template|string }}
 
   {% call form_wrapper() %}
+    <h3 class="govuk-heading-s govuk-!-margin-top-6 govuk-!-margin-bottom-1">
+      Start time
+    </h3>
+    <p class="govuk-body govuk-!-margin-bottom-4">
+      Your broadcast will start when it’s approved by another member of your team.
+    </p>
     {{ radio_select(
       form.finishes_at,
-      show_now_as_default=False
+      show_now_as_default=False,
+      bold_legend=True
     ) }}
     {{ page_footer('Submit for approval') }}
   {% endcall %}