diff --git a/app/presenters/formats/edition_format_presenter.rb b/app/presenters/formats/edition_format_presenter.rb
index da791fb7a..b2c2e8356 100644
--- a/app/presenters/formats/edition_format_presenter.rb
+++ b/app/presenters/formats/edition_format_presenter.rb
@@ -28,6 +28,7 @@ def required_fields(republish)
         schema_name:,
         document_type:,
         public_updated_at: public_updated_at.rfc3339(3),
+        last_edited_by_editor_id:,
         publishing_app: "publisher",
         rendering_app:,
         routes:,
@@ -36,7 +37,7 @@ def required_fields(republish)
         change_note: edition.latest_change_note,
         details:,
         locale: artefact.language,
-      }
+      }.compact
     end
 
     def schema_name
@@ -97,5 +98,12 @@ def major_change?
     def public_updated_at
       edition.public_updated_at || edition.updated_at
     end
+
+    # We can't reliably get the exact user who last edited the edition,
+    # so we rely on who created the edition, which is a fair enough
+    # approximation
+    def last_edited_by_editor_id
+      edition.created_by&.uid
+    end
   end
 end
diff --git a/test/support/presenter_test_helpers.rb b/test/support/presenter_test_helpers.rb
new file mode 100644
index 000000000..03f684fb0
--- /dev/null
+++ b/test/support/presenter_test_helpers.rb
@@ -0,0 +1,21 @@
+module PresenterTestHelpers
+  def it_includes_last_edited_by_editor_id
+    test "[:last_edited_by_editor_id] should return the creator of the edition" do
+      editor = FactoryBot.create(:user)
+      edition.actions.create!(request_type: Action::CREATE, requester: editor)
+
+      assert_equal editor.uid, result[:last_edited_by_editor_id]
+    end
+
+    test "[:last_edited_by_editor_id] should return the creator of a new version" do
+      editor = FactoryBot.create(:user)
+      edition.actions.create!(request_type: Action::NEW_VERSION, requester: editor)
+
+      assert_equal editor.uid, result[:last_edited_by_editor_id]
+    end
+
+    test "[:last_edited_by_editor_id] should return nil when there are no new version or create actions" do
+      assert_nil result[:last_edited_by_editor_id]
+    end
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index f1301db5e..3f7791f26 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -18,6 +18,7 @@
 require "support/action_processor_helpers"
 require "support/factories"
 require "support/local_services"
+require "support/presenter_test_helpers"
 require "govuk_schemas/assert_matchers"
 require "govuk_sidekiq/testing"
 
@@ -99,4 +100,5 @@ def login_as_homepage_editor
   include TabTestHelpers
   include HolidaysTestHelpers
   include ActionProcessorHelpers
+  extend PresenterTestHelpers
 end
diff --git a/test/unit/presenters/formats/answer_presenter_test.rb b/test/unit/presenters/formats/answer_presenter_test.rb
index 9d0225f69..315f43ee6 100644
--- a/test/unit/presenters/formats/answer_presenter_test.rb
+++ b/test/unit/presenters/formats/answer_presenter_test.rb
@@ -17,6 +17,8 @@ def result
     subject.render_for_publishing_api
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "be valid against schema" do
     assert_valid_against_publisher_schema(result, "answer")
   end
diff --git a/test/unit/presenters/formats/completed_transaction_presenter_test.rb b/test/unit/presenters/formats/completed_transaction_presenter_test.rb
index 523c93bb9..6b790628f 100644
--- a/test/unit/presenters/formats/completed_transaction_presenter_test.rb
+++ b/test/unit/presenters/formats/completed_transaction_presenter_test.rb
@@ -23,6 +23,8 @@ def result
     subject.render_for_publishing_api
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "be valid against schema" do
     assert_valid_against_publisher_schema(result, "completed_transaction")
   end
diff --git a/test/unit/presenters/formats/edition_format_presenter_test.rb b/test/unit/presenters/formats/edition_format_presenter_test.rb
index ea4bb7c89..2938d0967 100644
--- a/test/unit/presenters/formats/edition_format_presenter_test.rb
+++ b/test/unit/presenters/formats/edition_format_presenter_test.rb
@@ -29,6 +29,7 @@ def result
       edition.stubs :latest_change_note
       edition.stubs :auth_bypass_id
       edition.stubs :exact_route?
+      edition.stubs created_by: FactoryBot.build(:user)
 
       artefact.stubs :language
     end
@@ -160,5 +161,12 @@ def result
       expected = { auth_bypass_ids: %w[foo] }
       assert_equal expected, result[:access_limited]
     end
+
+    should "[:last_edited_by_editor_id]" do
+      uid = SecureRandom.uuid
+      user = FactoryBot.build(:user, uid:)
+      edition.expects(:created_by).returns(user)
+      assert_equal uid, result[:last_edited_by_editor_id]
+    end
   end
 end
diff --git a/test/unit/presenters/formats/guide_presenter_test.rb b/test/unit/presenters/formats/guide_presenter_test.rb
index f761813c9..411991a96 100644
--- a/test/unit/presenters/formats/guide_presenter_test.rb
+++ b/test/unit/presenters/formats/guide_presenter_test.rb
@@ -27,6 +27,8 @@ def result
     subject.render_for_publishing_api
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "be valid against schema" do
     assert_valid_against_publisher_schema(result, "guide")
   end
diff --git a/test/unit/presenters/formats/help_page_presenter_test.rb b/test/unit/presenters/formats/help_page_presenter_test.rb
index a43eac742..8b65a3b6b 100644
--- a/test/unit/presenters/formats/help_page_presenter_test.rb
+++ b/test/unit/presenters/formats/help_page_presenter_test.rb
@@ -21,6 +21,8 @@ def result
     assert_valid_against_publisher_schema(result, "help_page")
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "[:schema_name]" do
     assert_equal "help_page", result[:schema_name]
   end
diff --git a/test/unit/presenters/formats/licence_presenter_test.rb b/test/unit/presenters/formats/licence_presenter_test.rb
index 09b968c9b..1e08e1504 100644
--- a/test/unit/presenters/formats/licence_presenter_test.rb
+++ b/test/unit/presenters/formats/licence_presenter_test.rb
@@ -32,6 +32,8 @@ def result
     assert_valid_against_publisher_schema(result, "licence")
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "[:schema_name]" do
     assert_equal "licence", result[:schema_name]
   end
diff --git a/test/unit/presenters/formats/local_transaction_presenter_test.rb b/test/unit/presenters/formats/local_transaction_presenter_test.rb
index 9c83fc53d..ce207f747 100644
--- a/test/unit/presenters/formats/local_transaction_presenter_test.rb
+++ b/test/unit/presenters/formats/local_transaction_presenter_test.rb
@@ -36,6 +36,8 @@ def result
     assert_valid_against_publisher_schema(result, "local_transaction")
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "[:schema_name]" do
     assert_equal "local_transaction", result[:schema_name]
   end
diff --git a/test/unit/presenters/formats/place_presenter_test.rb b/test/unit/presenters/formats/place_presenter_test.rb
index 87ce7c109..ee5eb7b97 100644
--- a/test/unit/presenters/formats/place_presenter_test.rb
+++ b/test/unit/presenters/formats/place_presenter_test.rb
@@ -21,6 +21,8 @@ def result
     assert_valid_against_publisher_schema(result, "place")
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "[:schema_name]" do
     assert_equal "place", result[:schema_name]
   end
diff --git a/test/unit/presenters/formats/simple_smart_answer_presenter_test.rb b/test/unit/presenters/formats/simple_smart_answer_presenter_test.rb
index 87d2fbfe1..b1db8b2cf 100644
--- a/test/unit/presenters/formats/simple_smart_answer_presenter_test.rb
+++ b/test/unit/presenters/formats/simple_smart_answer_presenter_test.rb
@@ -60,6 +60,8 @@ def result
     subject.render_for_publishing_api
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "be valid against schema" do
     assert_valid_against_publisher_schema(result, "simple_smart_answer")
   end
diff --git a/test/unit/presenters/formats/transaction_presenter_test.rb b/test/unit/presenters/formats/transaction_presenter_test.rb
index c2fa273ef..5399d6f27 100644
--- a/test/unit/presenters/formats/transaction_presenter_test.rb
+++ b/test/unit/presenters/formats/transaction_presenter_test.rb
@@ -37,6 +37,8 @@ def result
     subject.render_for_publishing_api
   end
 
+  it_includes_last_edited_by_editor_id
+
   should "be valid against schema" do
     assert_valid_against_publisher_schema(result, "transaction")
   end