diff --git a/ds-caselaw-ingester/lambda_function.py b/ds-caselaw-ingester/lambda_function.py
index 0d5ab49..5043223 100644
--- a/ds-caselaw-ingester/lambda_function.py
+++ b/ds-caselaw-ingester/lambda_function.py
@@ -95,6 +95,9 @@ def save_s3_response(self, sqs_client, s3_client):
 
         return filename
 
+    def validate(self):
+        return
+
 
 class V2Message(Message):
     def is_v1(self):
@@ -120,6 +123,14 @@ def save_s3_response(self, sqs_client, s3_client):
         print(f"tar.gz saved locally as {filename}")
         return filename
 
+    def validate(self):
+        message_type = self.message["properties"]["messageType"]
+        if (
+            message_type
+            != "uk.gov.nationalarchives.da.messages.request.courtdocument.parse.RequestCourtDocumentParse"
+        ):
+            raise WrongMessageTypeError(f"Received message with type: {message_type}")
+
 
 class ReportableException(Exception):
     def __init__(self, *args, **kwargs):
@@ -127,6 +138,10 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
 
+class WrongMessageTypeError(ReportableException):
+    pass
+
+
 class S3HTTPError(ReportableException):
     pass
 
@@ -413,6 +428,8 @@ def unpublish_updated_judgment(uri):
 def handler(event, context):
     message = Message.from_event(event)
 
+    message.validate()
+
     consignment_reference = message.get_consignment_reference()
     print(f"Ingester Start: Consignment reference {consignment_reference}")
     print(f"Received Message: {message.message}")
diff --git a/ds-caselaw-ingester/tests.py b/ds-caselaw-ingester/tests.py
index a0161bb..9b702eb 100644
--- a/ds-caselaw-ingester/tests.py
+++ b/ds-caselaw-ingester/tests.py
@@ -25,8 +25,7 @@
 v2_message_raw = """
     {
         "properties": {
-            "messageType":
-                "uk.gov.nationalarchives.tre.messages.judgmentpackage.available.JudgmentPackageAvailable",
+            "messageType": "uk.gov.nationalarchives.da.messages.request.courtdocument.parse.RequestCourtDocumentParse",
             "timestamp": "2023-05-15T09:14:53.791409Z",
             "function": "staging-tre-judgment-packer-lambda",
             "producer": "TRE",