diff --git a/app/broadcast_message/rest.py b/app/broadcast_message/rest.py
index b034b08b3..3f2df6c64 100644
--- a/app/broadcast_message/rest.py
+++ b/app/broadcast_message/rest.py
@@ -185,13 +185,16 @@ def _create_broadcast_event(broadcast_message):
     else:
         transmitted_finishes_at = broadcast_message.finishes_at
 
-    # TODO: This doesn't support placeholders yet. We shouldn't use BroadcastMessageTemplate when we add placeholders
-    # as that just outputs XML, we need the raw text.
+    template = broadcast_message.template._as_utils_template_with_personalisation(
+        # Broadcast events don’t support personalisation yet
+        values={}
+    )
+
     event = BroadcastEvent(
         service=broadcast_message.service,
         broadcast_message=broadcast_message,
         message_type=msg_types[broadcast_message.status],
-        transmitted_content={"body": broadcast_message.template.content},
+        transmitted_content={"body": str(template)},
         transmitted_areas=broadcast_message.areas,
         # TODO: Probably move this somewhere more standalone too and imply that it shouldn't change. Should it include
         # a service based identifier too? eg "flood-warnings@notifications.service.gov.uk" or similar
diff --git a/app/models.py b/app/models.py
index cbe9a4e14..af5d54ace 100644
--- a/app/models.py
+++ b/app/models.py
@@ -2342,7 +2342,31 @@ class BroadcastEvent(db.Model):
 
     @property
     def reference(self):
-        return BroadcastMessageTemplate.from_event(self.serialize()).reference
+        notify_email_domain = current_app.config['NOTIFY_EMAIL_DOMAIN']
+        return (
+            f'https://www.{notify_email_domain}/,'
+            f'{self.id},'
+            f'{self.sent_at_as_cap_datetime_string}'
+        )
+
+    @property
+    def sent_at_as_cap_datetime_string(self):
+        return self.formatted_datetime_for('sent_at')
+
+    def formatted_datetime_for(self, property_name):
+        return self.convert_naive_utc_datetime_to_cap_standard_string(
+            getattr(self, property_name)
+        )
+
+    @staticmethod
+    def convert_naive_utc_datetime_to_cap_standard_string(dt):
+        """
+        As defined in section 3.3.2 of
+        http://docs.oasis-open.org/emergency/cap/v1.2/CAP-v1.2-os.html
+        They define the standard "YYYY-MM-DDThh:mm:ssXzh:zm", where X is
+        `+` if the timezone is > UTC, otherwise `-`
+        """
+        return f"{dt.strftime('%Y-%m-%dT%H:%M:%S')}-00:00"
 
     def get_earlier_message_references(self):
         from app.dao.broadcast_message_dao import get_earlier_events_for_broadcast_event
diff --git a/requirements-app.txt b/requirements-app.txt
index 53296e63d..ded61f2c9 100644
--- a/requirements-app.txt
+++ b/requirements-app.txt
@@ -29,7 +29,7 @@ notifications-python-client==5.7.0
 # PaaS
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@42.2.1#egg=notifications-utils==42.2.1
+git+https://github.com/alphagov/notifications-utils.git@43.0.0#egg=notifications-utils==43.0.0
 
 # gds-metrics requires prometheseus 0.2.0, override that requirement as 0.7.1 brings significant performance gains
 prometheus-client==0.8.0
diff --git a/requirements.txt b/requirements.txt
index 1ed979fee..cae9c641a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ notifications-python-client==5.7.0
 # PaaS
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@42.2.1#egg=notifications-utils==42.2.1
+git+https://github.com/alphagov/notifications-utils.git@43.0.0#egg=notifications-utils==43.0.0
 
 # gds-metrics requires prometheseus 0.2.0, override that requirement as 0.7.1 brings significant performance gains
 prometheus-client==0.8.0
@@ -42,14 +42,14 @@ alembic==1.4.3
 amqp==1.4.9
 anyjson==0.3.3
 attrs==20.2.0
-awscli==1.18.148
+awscli==1.18.164
 bcrypt==3.2.0
 billiard==3.3.0.23
 bleach==3.1.4
 blinker==1.4
 boto==2.49.0
 boto3==1.10.38
-botocore==1.18.7
+botocore==1.19.4
 certifi==2020.6.20
 chardet==3.0.4
 click==7.1.2
@@ -66,7 +66,6 @@ importlib-metadata==2.0.0
 Jinja2==2.11.2
 jmespath==0.10.0
 kombu==3.0.37
-lxml==4.5.1
 Mako==1.1.3
 MarkupSafe==1.1.1
 mistune==0.8.4
@@ -89,7 +88,7 @@ s3transfer==0.3.3
 six==1.15.0
 smartypants==2.0.1
 statsd==3.3.0
-urllib3==1.25.10
+urllib3==1.25.11
 webencodings==0.5.1
 Werkzeug==1.0.1
-zipp==3.2.0
+zipp==3.4.0