diff --git a/update_gwr_advance_ticket_date.py b/update_gwr_advance_ticket_date.py
index 2ee6433..14b5ab0 100755
--- a/update_gwr_advance_ticket_date.py
+++ b/update_gwr_advance_ticket_date.py
@@ -62,8 +62,8 @@ def main() -> None:
             print("date has't changed:", existing_date)
         return
 
-    subject = "New GWR advance ticket booking date: {new_date}"
-    body = """Old date: {old_date}
+    subject = f"New GWR advance ticket booking date: {new_date}"
+    body = f"""Old date: {existing_date}
 New date: {new_date}
 
 {gwr.url}