diff --git a/.trufflehogignore b/.trufflehogignore
index c258858a..3bfd91a2 100644
--- a/.trufflehogignore
+++ b/.trufflehogignore
@@ -1,3 +1,4 @@
 .git
 .playwright-browsers
 poetry.lock
+.terraform
diff --git a/postgres/database-load/locals.tf b/postgres/database-load/locals.tf
index b7998c06..8ec72ec8 100644
--- a/postgres/database-load/locals.tf
+++ b/postgres/database-load/locals.tf
@@ -9,9 +9,8 @@ locals {
 
   task_name = "${var.application}-${var.environment}-${var.database_name}-load"
 
-  dump_task_name     = "${var.application}-${var.task.from}-${var.database_name}-dump"
-  dump_kms_key_alias = "alias/${local.dump_task_name}"
-  dump_bucket_name   = local.dump_task_name
+  dump_task_name   = "${var.application}-${var.task.from}-${var.database_name}-dump"
+  dump_bucket_name = local.dump_task_name
 
   pipeline_task  = lookup(var.task, "pipeline", null) != null
   region_account = "${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}"
diff --git a/postgres/database-load/tests/unit.tftest.hcl b/postgres/database-load/tests/unit.tftest.hcl
index 24f74cf1..171c979d 100644
--- a/postgres/database-load/tests/unit.tftest.hcl
+++ b/postgres/database-load/tests/unit.tftest.hcl
@@ -42,13 +42,18 @@ run "data_load_unit_test" {
   command = plan
 
   assert {
-    condition     = local.dump_kms_key_alias == "alias/test-app-some-other-env-test-db-dump"
-    error_message = "Dump Kms key alias should be: alias/test-app-some-other-env-test-db-dump"
+    condition     = local.dump_bucket_name == "test-app-some-other-env-test-db-dump"
+    error_message = "Dump bucket name should be: test-app-some-other-env-test-db-dump"
   }
 
   assert {
-    condition     = local.dump_bucket_name == "test-app-some-other-env-test-db-dump"
-    error_message = "Dump bucket name should be: test-app-some-other-env-test-db-dump"
+    condition     = local.task_name == "test-app-test-env-test-db-load"
+    error_message = "Task name incorrect"
+  }
+
+  assert {
+    condition     = local.dump_task_name == "test-app-some-other-env-test-db-dump"
+    error_message = "Dump task name incorrect"
   }
 
   assert {
diff --git a/s3/main.tf b/s3/main.tf
index 166592a0..0b50a254 100644
--- a/s3/main.tf
+++ b/s3/main.tf
@@ -57,6 +57,27 @@ data "aws_iam_policy_document" "bucket-policy" {
       resources = [aws_s3_bucket.this.arn, "${aws_s3_bucket.this.arn}/*"]
     }
   }
+
+  dynamic "statement" {
+    for_each = coalesce(var.config.cross_environment_service_access, {})
+    content {
+      effect = "Allow"
+      actions = flatten([
+        statement.value.read ? ["s3:Get*", "s3:ListBucket"] : [],
+        statement.value.write ? ["s3:Put*"] : [],
+      ])
+      principals {
+        identifiers = ["*"]
+        type        = "AWS"
+      }
+      condition {
+        test     = "StringLike"
+        values   = ["arn:aws:iam::${statement.value.account}:role/${statement.value.application}-${statement.value.environment}-${statement.value.service}-TaskRole-*"]
+        variable = "aws:PrincipalArn"
+      }
+      resources = [aws_s3_bucket.this.arn, "${aws_s3_bucket.this.arn}/*"]
+    }
+  }
 }
 
 resource "aws_s3_bucket_policy" "bucket-policy" {
@@ -126,6 +147,27 @@ data "aws_iam_policy_document" "key-policy" {
       resources = [aws_kms_key.kms-key[0].arn]
     }
   }
+
+  dynamic "statement" {
+    for_each = coalesce(var.config.cross_environment_service_access, {})
+    content {
+      effect = "Allow"
+      actions = flatten([
+        statement.value.read ? ["kms:Decrypt"] : [],
+        statement.value.write ? ["kms:GenerateDataKey"] : [],
+      ])
+      principals {
+        identifiers = ["*"]
+        type        = "AWS"
+      }
+      condition {
+        test     = "StringLike"
+        values   = ["arn:aws:iam::${statement.value.account}:role/${statement.value.application}-${statement.value.environment}-${statement.value.service}-TaskRole-*"]
+        variable = "aws:PrincipalArn"
+      }
+      resources = [aws_kms_key.kms-key[0].arn]
+    }
+  }
 }
 
 resource "aws_kms_key_policy" "key-policy" {
diff --git a/s3/tests/unit.tftest.hcl b/s3/tests/unit.tftest.hcl
index 641a0f37..e53d8ce2 100644
--- a/s3/tests/unit.tftest.hcl
+++ b/s3/tests/unit.tftest.hcl
@@ -442,6 +442,153 @@ run "aws_s3_bucket_external_role_access_invalid_cyber_sign_off" {
   expect_failures = [var.config.external_role_access.cyber_sign_off_by]
 }
 
+run "aws_s3_bucket_cross_environment_service_access_read_write_unit_test" {
+  command = plan
+
+  variables {
+    config = {
+      "bucket_name" = "dbt-terraform-test-s3-cross-env-service-access",
+      "type"        = "s3",
+      "cross_environment_service_access" = {
+        "test-access" = {
+          "application"       = "app",
+          "environment"       = "test",
+          "account"           = "123456789012",
+          "service"           = "service",
+          "read"              = true,
+          "write"             = true,
+          "cyber_sign_off_by" = "test@businessandtrade.gov.uk"
+        }
+      }
+    }
+  }
+
+  assert {
+    condition     = data.aws_iam_policy_document.bucket-policy.statement[1].effect == "Allow"
+    error_message = "Should be: Allow"
+  }
+
+  assert {
+    condition     = length([for item in data.aws_iam_policy_document.bucket-policy.statement[1].condition : item if item.test == "StringLike"]) == 1
+    error_message = "condition should have a test: StringLike attribute"
+  }
+
+  assert {
+    condition     = length([for item in data.aws_iam_policy_document.bucket-policy.statement[1].condition : item if item.variable == "aws:PrincipalArn"]) == 1
+    error_message = "condition should have a variable: aws:PrincipalArn attribute"
+  }
+
+  assert {
+    condition = length([for item in data.aws_iam_policy_document.bucket-policy.statement[1].condition :
+    item if item.values == tolist(["arn:aws:iam::123456789012:role/app-test-service-TaskRole-*"])]) == 1
+    error_message = "condition should have a values: [bucket arn] attribute"
+  }
+
+  assert {
+    condition = alltrue([
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Get*"),
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Put*"),
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:ListBucket"),
+    ])
+    error_message = "Should be: s3:Get*, s3:Put*, s3:ListBucket"
+  }
+}
+
+run "aws_s3_bucket_cross_environment_service_access_read_only_unit_test" {
+  command = plan
+
+  variables {
+    config = {
+      "bucket_name" = "dbt-terraform-test-s3-cross-env-service-access",
+      "type"        = "s3",
+      "cross_environment_service_access" = {
+        "test-access" = {
+          "application"       = "app",
+          "environment"       = "test",
+          "account"           = "123456789012",
+          "service"           = "service",
+          "read"              = true,
+          "write"             = false,
+          "cyber_sign_off_by" = "test@businessandtrade.gov.uk"
+        }
+      }
+    }
+  }
+
+  assert {
+    condition     = data.aws_iam_policy_document.bucket-policy.statement[1].effect == "Allow"
+    error_message = "Should be: Allow"
+  }
+
+  assert {
+    condition = alltrue([
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Get*"),
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:ListBucket"),
+      !contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Put*"),
+    ])
+    error_message = "Should be: s3:Get*, s3:ListBucket"
+  }
+}
+
+run "aws_s3_bucket_cross_environment_service_access_write_only_unit_test" {
+  command = plan
+
+  variables {
+    config = {
+      "bucket_name" = "dbt-terraform-test-s3-cross-env-service-access",
+      "type"        = "s3",
+      "cross_environment_service_access" = {
+        "test-access" = {
+          "application"       = "app",
+          "environment"       = "test",
+          "account"           = "123456789012",
+          "service"           = "service",
+          "read"              = false,
+          "write"             = true,
+          "cyber_sign_off_by" = "test@businessandtrade.gov.uk"
+        }
+      }
+    }
+  }
+
+  assert {
+    condition     = data.aws_iam_policy_document.bucket-policy.statement[1].effect == "Allow"
+    error_message = "Should be: Allow"
+  }
+
+  assert {
+    condition = alltrue([
+      !contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Get*"),
+      !contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:ListBucket"),
+      contains(data.aws_iam_policy_document.bucket-policy.statement[1].actions, "s3:Put*"),
+    ])
+    error_message = "Should be: s3:Put*"
+  }
+}
+
+run "aws_s3_bucket_cross_environment_service_access_invalid_cyber_sign_off" {
+  command = plan
+
+  variables {
+    config = {
+      "bucket_name" = "dbt-terraform-test-s3-cross-env-service-access",
+      "type"        = "s3",
+      "cross_environment_service_access" = {
+        "test-access" = {
+          "application"       = "app",
+          "environment"       = "test",
+          "account"           = "123456789012",
+          "service"           = "service",
+          "read"              = true,
+          "write"             = true,
+          "cyber_sign_off_by" = "no-one"
+        }
+      }
+    }
+  }
+  expect_failures = [var.config.cross_environment_service_access.cyber_sign_off_by]
+}
+
 run "aws_s3_bucket_object_lock_configuration_governance_unit_test" {
   command = plan
 
diff --git a/s3/variables.tf b/s3/variables.tf
index 43f1bc79..ce9f915c 100644
--- a/s3/variables.tf
+++ b/s3/variables.tf
@@ -41,6 +41,16 @@ variable "config" {
       write             = bool
       cyber_sign_off_by = string
     })))
+    # NOTE: allows access to S3 bucket from DBT Platform managed service roles, also generates Copilot addon for service access
+    cross_environment_service_access = optional(map(object({
+      application       = string
+      account           = string
+      environment       = string
+      service           = string
+      read              = bool
+      write             = bool
+      cyber_sign_off_by = string
+    })))
     # NOTE: readonly access is managed by Copilot server addon s3 policy.
     readonly                = optional(bool)
     serve_static_content    = optional(bool, false)
@@ -69,4 +79,12 @@ variable "config" {
     ])
     error_message = "All instances of external_role_access must be approved by cyber, and a cyber rep's email address entered."
   }
+
+  validation {
+    condition = var.config.cross_environment_service_access == null ? true : alltrue([
+      for k, v in var.config.cross_environment_service_access : (can(regex("^[\\w\\-\\.]+@(businessandtrade.gov.uk|digital.trade.gov.uk)$", v.cyber_sign_off_by)))
+    ])
+    error_message = "All instances of cross_environment_service_access must be approved by cyber, and a cyber rep's email address entered."
+  }
+
 }