diff --git a/help_to_heat/frontdoor/views.py b/help_to_heat/frontdoor/views.py
index 288d2a12..a98753eb 100644
--- a/help_to_heat/frontdoor/views.py
+++ b/help_to_heat/frontdoor/views.py
@@ -82,6 +82,10 @@
 unavailable_suppliers = []
 
 
+def format_referral_id(referral_id):
+    return f"GBIS{referral_id:07}"
+
+
 def unavailable_supplier_redirect(session_id):
     session_data = interface.api.session.get_session(session_id)
     supplier = session_data["supplier"]
@@ -840,7 +844,8 @@ class SuccessView(PageView):
     def get_context(self, session_id, *args, **kwargs):
         supplier = SupplierConverter(session_id).get_supplier_on_success_page()
         session = interface.api.session.get_session(session_id)
-        return {"supplier": supplier, "safe_to_cache": True, "referral_id": session.get("referral_id")}
+        referral_id = format_referral_id(session.get("referral_id"))
+        return {"supplier": supplier, "safe_to_cache": True, "referral_id": referral_id}
 
 
 class FeedbackView(utils.MethodDispatcher):
diff --git a/help_to_heat/portal/email_handler.py b/help_to_heat/portal/email_handler.py
index 30322f18..71ba47b0 100644
--- a/help_to_heat/portal/email_handler.py
+++ b/help_to_heat/portal/email_handler.py
@@ -8,6 +8,7 @@
 from django.urls import reverse
 from django.utils import timezone
 
+from help_to_heat.frontdoor import views
 from help_to_heat.portal import models
 
 logger = logging.getLogger(__name__)
@@ -127,7 +128,8 @@ def send_referral_confirmation_email(session_data, language_code):
     else:
         data = EMAIL_MAPPING["referral-confirmation"]
         data["subject"] = f"Referral to {session_data.get('supplier')} successful"
-    context = {"supplier_name": session_data.get("supplier")}
+    referral_id = views.format_referral_id(session_data["referral_id"])
+    context = {"supplier_name": session_data.get("supplier"), "referral_id": referral_id}
     return _send_normal_email(to_address=session_data.get("email"), context=context, **data)
 
 
diff --git a/help_to_heat/templates/frontdoor/success.html b/help_to_heat/templates/frontdoor/success.html
index 8e607798..dbdbbc7f 100644
--- a/help_to_heat/templates/frontdoor/success.html
+++ b/help_to_heat/templates/frontdoor/success.html
@@ -12,7 +12,7 @@
         <h1 class="govuk-panel__title">
           {{_("Your details have been submitted to %(supplier)s") % { "supplier": supplier }}}
         </h1>
-        <p>{{_("Your referral ID is %(referral_id)s") % { "referral_id": referral_id }}}</p>
+        <div class="govuk-panel__body">{{_("Your reference number is %(referral_id)s") % { "referral_id": referral_id }}}</div>
       </div>
       <p class="govuk-body">{{_("If you provided an email address in your referral then we have sent you a confirmation email.")}}</p>
       <p class="govuk-body" data-show-if-can-print="true" hidden>{{_("You can ")}}<a href="#"  class="govuk-link" data-print="true">{{_("save or print a copy of your referral")}}</a>.</p>
diff --git a/help_to_heat/templates/portal/email/referral-confirmation.txt b/help_to_heat/templates/portal/email/referral-confirmation.txt
index 3cdefbd4..caf1bf8c 100644
--- a/help_to_heat/templates/portal/email/referral-confirmation.txt
+++ b/help_to_heat/templates/portal/email/referral-confirmation.txt
@@ -1,5 +1,7 @@
 Hi,
 
+Your reference number is {{referral_id}}
+
 Your details have been submitted to {{supplier_name}}.
 
 # What happens next?