diff --git a/orchestration/abri_orchestrator.py b/orchestration/abri_orchestrator.py
index 3238066f4..397bc9d77 100644
--- a/orchestration/abri_orchestrator.py
+++ b/orchestration/abri_orchestrator.py
@@ -233,7 +233,19 @@ class AbriOrchestrator:
     def amend_job(
         self, booking: ConfirmedSurveyBooking
     ) -> AmendJobOrchestrationResult:
-        raise NotImplementedError
+        job_no = self._deal_database.job_no_for_deal(booking.deal_id)
+        if job_no is None:
+            raise JobNoNotYetRecordedError(deal_id=booking.deal_id)
+
+        return self._abri.amend_job(
+            AmendJobRequest(
+                job_no=job_no,
+                appointment_date=booking.confirmed_survey_date,
+                appointment_time=slot_for_confirmed_time(
+                    booking.confirmed_survey_time
+                ),
+            )
+        )
 
     def log_job(self, booking: ConfirmedSurveyBooking) -> LogJobOrchestrationResult:
         descriptions = build_job_descriptions(booking.deal_name)
diff --git a/scripts/smoke_test_tenant_contacts.py b/scripts/smoke_test_tenant_contacts.py
index f9b55dc3b..8dedeedac 100644
--- a/scripts/smoke_test_tenant_contacts.py
+++ b/scripts/smoke_test_tenant_contacts.py
@@ -22,7 +22,7 @@ All tenant details below are fictional (Ofcom-reserved number ranges).
 
 import os
 from pathlib import Path
-from typing import Any, List, cast
+from typing import Any, List, Optional, cast
 
 from dotenv import dotenv_values
 from hubspot.client import Client  # type: ignore[reportMissingTypeStubs]
@@ -101,11 +101,14 @@ def _stubbed_abri_client() -> AbriClient:
 
 
 class _UnusedDealDatabase:
-    """Satisfies the gateway dependency; the tenant-data flow never writes it."""
+    """Satisfies the gateway dependency; the tenant-data flow never touches it."""
 
     def record_job_no(self, deal_id: str, job_no: str) -> None:
         raise AssertionError("tenant-data sync must not touch the deal database")
 
+    def job_no_for_deal(self, deal_id: str) -> Optional[str]:
+        raise AssertionError("tenant-data sync must not touch the deal database")
+
 
 def _archive_contacts(sdk_client: Client) -> None:
     if not CONTACT_IDS_TO_ARCHIVE:
diff --git a/tests/orchestration/test_abri_orchestrator_log_job.py b/tests/orchestration/test_abri_orchestrator_log_job.py
index b91739c52..c47a7fcd2 100644
--- a/tests/orchestration/test_abri_orchestrator_log_job.py
+++ b/tests/orchestration/test_abri_orchestrator_log_job.py
@@ -3,7 +3,7 @@ import traceback
 import xml.etree.ElementTree as ET
 from datetime import date
 from pathlib import Path
-from typing import List, Tuple
+from typing import List, Optional, Tuple
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -57,6 +57,16 @@ class FakeDealDatabase:
     def record_job_no(self, deal_id: str, job_no: str) -> None:
         self.recorded_job_nos.append((deal_id, job_no))
 
+    def job_no_for_deal(self, deal_id: str) -> Optional[str]:
+        return next(
+            (
+                job_no
+                for recorded_deal_id, job_no in self.recorded_job_nos
+                if recorded_deal_id == deal_id
+            ),
+            None,
+        )
+
 
 @pytest.fixture()
 def mock_session() -> MagicMock:
diff --git a/tests/orchestration/test_abri_orchestrator_tenant_data_sync.py b/tests/orchestration/test_abri_orchestrator_tenant_data_sync.py
index e45e48686..58b82dd82 100644
--- a/tests/orchestration/test_abri_orchestrator_tenant_data_sync.py
+++ b/tests/orchestration/test_abri_orchestrator_tenant_data_sync.py
@@ -2,6 +2,7 @@ import json
 import traceback
 import xml.etree.ElementTree as ET
 from pathlib import Path
+from typing import Optional
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -66,6 +67,9 @@ class FakeDealDatabase:
     def record_job_no(self, deal_id: str, job_no: str) -> None:
         raise AssertionError("tenant-data sync must not touch the deal database")
 
+    def job_no_for_deal(self, deal_id: str) -> Optional[str]:
+        raise AssertionError("tenant-data sync must not touch the deal database")
+
 
 @pytest.fixture()
 def orchestrator(