diff --git a/infrastructure/abri/abri_client.py b/infrastructure/abri/abri_client.py
index 4342ba946..f9b1ddc1f 100644
--- a/infrastructure/abri/abri_client.py
+++ b/infrastructure/abri/abri_client.py
@@ -7,6 +7,7 @@ from domain.abri.models import (
     AbriRequestRejected,
     AmendJobRequest,
     AmendJobResult,
+    AppointmentAmended,
     JobLogged,
     LogJobRequest,
     LogJobResult,
@@ -48,7 +49,20 @@ class AbriClient:
         return self._parse_job_logged(outcome)
 
     def amend_job(self, request: AmendJobRequest) -> AmendJobResult:
-        raise NotImplementedError
+        outcome = self._exchange(
+            request_type="amendoptiappt",
+            parameters=[
+                ("job_no", request.job_no),
+                ("action", "amend"),
+                ("appointment_date", request.appointment_date.strftime("%d/%m/%Y")),
+                ("appointment_time", request.appointment_time),
+            ],
+        )
+
+        if isinstance(outcome, AbriRequestRejected):
+            return outcome
+
+        return self._parse_appointment_amended(outcome)
 
     def _exchange(
         self, request_type: str, parameters: List[Tuple[str, str]]
@@ -106,6 +120,31 @@ class AbriClient:
 
         return JobLogged(job_no=job_no, logged_info=logged_info)
 
+    @staticmethod
+    def _parse_appointment_amended(root: ET.Element) -> AppointmentAmended:
+        amended = root.find("AmendOptiAppt")
+
+        if amended is None:
+            raise AbriResponseParseError(
+                "AmendOptiAppt element missing from relay response"
+            )
+
+        job_no = amended.get("job_no")
+        appointment_date = amended.get("appointment_date")
+        appointment_time = amended.get("appointment_time")
+
+        if job_no is None or appointment_date is None or appointment_time is None:
+            raise AbriResponseParseError(
+                "AmendOptiAppt element missing job_no, appointment_date "
+                "or appointment_time"
+            )
+
+        return AppointmentAmended(
+            job_no=job_no,
+            appointment_date=appointment_date,
+            appointment_time=appointment_time,
+        )
+
     @staticmethod
     def _parse_rejection(root: ET.Element) -> AbriRequestRejected:
         success = root.findtext("success")