diff --git a/src/eligibility_signposting_api/audit/audit_models.py b/src/eligibility_signposting_api/audit/audit_models.py
index d80409a8c..5ce4e598f 100644
--- a/src/eligibility_signposting_api/audit/audit_models.py
+++ b/src/eligibility_signposting_api/audit/audit_models.py
@@ -70,9 +70,9 @@ class AuditAction(CamelCaseBaseModel):
 
 class AuditCondition(CamelCaseBaseModel):
     campaign_id: str | None = None
-    campaign_version: str | None = None
+    campaign_version: int | None = None
     iteration_id: str | None = None
-    iteration_version: str | None = None
+    iteration_version: int | None = None
     condition_name: str | None = None
     status: str | None = None
     status_text: str | None = None
diff --git a/src/eligibility_signposting_api/model/campaign_config.py b/src/eligibility_signposting_api/model/campaign_config.py
index b7409baea..cc67fbc98 100644
--- a/src/eligibility_signposting_api/model/campaign_config.py
+++ b/src/eligibility_signposting_api/model/campaign_config.py
@@ -17,10 +17,10 @@
     from pydantic import SerializationInfo
 
 CampaignName = NewType("CampaignName", str)
-CampaignVersion = NewType("CampaignVersion", str)
+CampaignVersion = NewType("CampaignVersion", int)
 CampaignID = NewType("CampaignID", str)
 IterationName = NewType("IterationName", str)
-IterationVersion = NewType("IterationVersion", str)
+IterationVersion = NewType("IterationVersion", int)
 IterationID = NewType("IterationID", str)
 IterationDate = NewType("IterationDate", date)
 RuleName = NewType("RuleName", str)
@@ -185,9 +185,9 @@ class CampaignConfig(BaseModel):
     name: CampaignName = Field(..., alias="Name")
     type: Literal["V", "S"] = Field(..., alias="Type")
     target: Literal["COVID", "FLU", "MMR", "RSV"] = Field(..., alias="Target")
-    manager: str | None = Field(None, alias="Manager")
-    approver: str | None = Field(None, alias="Approver")
-    reviewer: str | None = Field(None, alias="Reviewer")
+    manager: list[str] | None = Field(None, alias="Manager")
+    approver: list[str] | None = Field(None, alias="Approver")
+    reviewer: list[str] | None = Field(None, alias="Reviewer")
     iteration_frequency: Literal["X", "D", "W", "M", "Q", "A"] = Field(..., alias="IterationFrequency")
     iteration_type: Literal["A", "M", "S", "O"] = Field(..., alias="IterationType")
     iteration_time: str | None = Field(None, alias="IterationTime")
diff --git a/tests/unit/audit/test_audit_context.py b/tests/unit/audit/test_audit_context.py
index ccd55a5f7..40abf9c80 100644
--- a/tests/unit/audit/test_audit_context.py
+++ b/tests/unit/audit/test_audit_context.py
@@ -99,7 +99,7 @@ def test_append_audit_condition_adds_condition_to_audit_log_on_g(app):
     ]
 
     condition_name = ConditionName("Condition1")
-    iteration = IterationFactory.build()
+    iteration = IterationFactory.build(version=12345)
     audit_rules = [
         Reason(
             rule_type=RuleType.filter,
@@ -119,7 +119,7 @@ def test_append_audit_condition_adds_condition_to_audit_log_on_g(app):
     iteration_result = IterationResult(
         status=Status.actionable, cohort_results=[cohort_group_result], actions=suggested_actions
     )
-    campaign_details = (CampaignID("CampaignID1"), CampaignVersion("CampaignVersion1"))
+    campaign_details = (CampaignID("CampaignID1"), CampaignVersion(123))
     matched_action_detail = MatchedActionDetail(RuleName("RedirectRuleName1"), RulePriority("1"), suggested_actions)
 
     best_iteration_results = BestIterationResult(
diff --git a/tests/unit/model/test_campaign_config.py b/tests/unit/model/test_campaign_config.py
index 28f96d799..bab1aa102 100644
--- a/tests/unit/model/test_campaign_config.py
+++ b/tests/unit/model/test_campaign_config.py
@@ -92,3 +92,23 @@ def test_iteration_rule_deserialisation(rule_stop: str, expected):
 
     # Then
     assert_that(actual, is_iteration_rule().with_rule_stop(expected))
+
+
+@pytest.mark.parametrize(
+    ("field_name", "value"),
+    [
+        ("manager", "manager@test.com"),
+        ("approver", "approver@test.com"),
+        ("reviewer", "reviewer@test.com"),
+    ],
+)
+def test_campaign_should_accept_list_of_strings_for_different_role_emails(field_name: str, value: str):
+    # Given
+    kwargs = {field_name: value}
+
+    # When, Then
+    with pytest.raises(
+        ValueError,
+        match=rf"1 validation error for CampaignConfig\n{field_name}\n\s+Input should be a valid list.*",
+    ):
+        RawCampaignConfigFactory.build(**kwargs)