diff --git a/app/services/imports/lettings_logs_import_service.rb b/app/services/imports/lettings_logs_import_service.rb
index 59d30172c..299326691 100644
--- a/app/services/imports/lettings_logs_import_service.rb
+++ b/app/services/imports/lettings_logs_import_service.rb
@@ -289,16 +289,23 @@ module Imports
     def save_lettings_log(attributes, previous_status)
       lettings_log = LettingsLog.new(attributes)
       begin
-        lettings_log.save!
-        lettings_log
-      rescue ActiveRecord::RecordNotUnique
         legacy_id = attributes["old_id"]
         record = LettingsLog.find_by(old_id: legacy_id)
-        if allow_updates
-          attributes["updated_at"] = Time.zone.now
-          record.update!(attributes)
+        if record.present?
+          if allow_updates
+            attributes["updated_at"] = Time.zone.now
+            record.update!(attributes)
+          end
+          record
+        else
+          duplicate_logs = lettings_log.created_by.lettings_logs.duplicate_logs(lettings_log)
+          if duplicate_logs.count.positive?
+            @logger.info("Duplicate log with id #{duplicate_logs.map(&:id).join(', ')} found for log #{lettings_log.old_id}, skipping log")
+          else
+            lettings_log.save!
+          end
+          lettings_log
         end
-        record
       rescue ActiveRecord::RecordInvalid => e
         rescue_validation_or_raise(lettings_log, attributes, previous_status, e)
       end
diff --git a/spec/services/imports/lettings_logs_import_service_spec.rb b/spec/services/imports/lettings_logs_import_service_spec.rb
index 1dd5c5578..45bfd3331 100644
--- a/spec/services/imports/lettings_logs_import_service_spec.rb
+++ b/spec/services/imports/lettings_logs_import_service_spec.rb
@@ -103,6 +103,22 @@ RSpec.describe Imports::LettingsLogsImportService do
         expect(updated_logs).to eq(0)
       end
 
+      it "does not import the log if a duplicate log exists on the system" do
+        expect(logger).not_to receive(:error)
+        expect(logger).not_to receive(:warn)
+        expect(logger).not_to receive(:info).with(/Updating lettings log/)
+        expect(logger).to receive(:info).with(/Duplicate log with id \d+ found for log #{lettings_log_id}, skipping log/)
+        expect(logger).to receive(:info).with(/Duplicate log with id \d+ found for log #{lettings_log_id2}, skipping log/)
+        expect(logger).to receive(:info).with(/Duplicate log with id \d+ found for log #{lettings_log_id3}, skipping log/)
+
+        lettings_log_service.create_logs(remote_folder)
+        expect(LettingsLog.count).to eq(3)
+        LettingsLog.update_all(old_id: nil)
+
+        lettings_log_service.create_logs(remote_folder)
+        expect(LettingsLog.count).to eq(3)
+      end
+
       context "with updates allowed" do
         subject(:lettings_log_service) { described_class.new(storage_service, logger, allow_updates: true) }
 
@@ -151,6 +167,7 @@ RSpec.describe Imports::LettingsLogsImportService do
           expect(logger).to receive(:error).with("Lettings log 'fake_id' belongs to legacy user with owner-user-id: 'fake_id' which cannot be found. Assigning log to 'Unassigned' user.")
           lettings_log_service.send(:create_log, lettings_log_xml)
           lettings_log_xml.at_xpath("//meta:document-id").content = "fake_id"
+          lettings_log_xml.at_xpath("//xmlns:_2bTenCode").content = "fake_code"
           lettings_log_service.send(:create_log, lettings_log_xml)
 
           lettings_log = LettingsLog.where(old_id: lettings_log_id).first
@@ -188,6 +205,7 @@ RSpec.describe Imports::LettingsLogsImportService do
           expect(logger).to receive(:error).with("Lettings log 'fake_id' does not have the owner id. Assigning log to 'Unassigned' user.")
           lettings_log_service.send(:create_log, lettings_log_xml)
           lettings_log_xml.at_xpath("//meta:document-id").content = "fake_id"
+          lettings_log_xml.at_xpath("//xmlns:_2bTenCode").content = "fake_code"
           lettings_log_service.send(:create_log, lettings_log_xml)
 
           lettings_log = LettingsLog.where(old_id: lettings_log_id).first
@@ -215,6 +233,7 @@ RSpec.describe Imports::LettingsLogsImportService do
           expect(logger).to receive(:error).with("Lettings log 'fake_id' belongs to legacy user with owner-user-id: 'fake_id' which belongs to a different organisation. Assigning log to 'Unassigned' user.")
           lettings_log_service.send(:create_log, lettings_log_xml)
           lettings_log_xml.at_xpath("//meta:document-id").content = "fake_id"
+          lettings_log_xml.at_xpath("//xmlns:_2bTenCode").content = "fake_code"
           lettings_log_service.send(:create_log, lettings_log_xml)
 
           lettings_log = LettingsLog.where(old_id: lettings_log_id).first