diff --git a/app/controllers/collection_resources_controller.rb b/app/controllers/collection_resources_controller.rb
index 7d0a18652..06988c88c 100644
--- a/app/controllers/collection_resources_controller.rb
+++ b/app/controllers/collection_resources_controller.rb
@@ -35,7 +35,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def edit_mandatory_collection_resource
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     year = params[:year].to_i
     resource_type = params[:resource_type]
@@ -51,7 +51,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def edit_additional_collection_resource
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
 
@@ -62,7 +62,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def update_mandatory_collection_resource
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     year = resource_params[:year].to_i
     resource_type = resource_params[:resource_type]
@@ -92,7 +92,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def update_additional_collection_resource
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
 
@@ -122,7 +122,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def confirm_mandatory_collection_resources_release
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     @year = params[:year].to_i
 
@@ -132,7 +132,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def release_mandatory_collection_resources
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     year = params[:year].to_i
 
@@ -145,7 +145,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def new
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     year = params[:year].to_i
     log_type = params[:log_type]
@@ -156,7 +156,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def create
-    return render_not_found unless current_user.support? && editable_collection_resource_years.include?(resource_params[:year].to_i)
+    return render_not_authorized unless current_user.support? && editable_collection_resource_years.include?(resource_params[:year].to_i)
 
     @collection_resource = CollectionResource.new(resource_params)
     @collection_resource.download_filename ||= @collection_resource.file&.original_filename
@@ -185,7 +185,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def delete_confirmation
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
 
@@ -195,7 +195,7 @@ class CollectionResourcesController < ApplicationController
   end
 
   def delete
-    return render_not_found unless current_user.support?
+    return render_not_authorized unless current_user.support?
 
     @collection_resource = CollectionResource.find_by(id: params[:collection_resource_id])
 
diff --git a/spec/requests/collection_resources_controller_spec.rb b/spec/requests/collection_resources_controller_spec.rb
index 5bf1d2843..eb6f56aed 100644
--- a/spec/requests/collection_resources_controller_spec.rb
+++ b/spec/requests/collection_resources_controller_spec.rb
@@ -277,9 +277,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get edit_mandatory_collection_resource_path(year: 2024, log_type: "sales", resource_type: "bulk_upload_template")
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -290,9 +290,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get edit_mandatory_collection_resource_path(year: 2024, log_type: "sales", resource_type: "bulk_upload_template")
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -366,9 +366,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch update_mandatory_collection_resource_path, params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -379,9 +379,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch update_mandatory_collection_resource_path, params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
   end
@@ -401,9 +401,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get confirm_mandatory_collection_resources_release_path(year: 2025)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -414,9 +414,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get confirm_mandatory_collection_resources_release_path(year: 2025)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -466,9 +466,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch release_mandatory_collection_resources_path(year: 2024)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -479,9 +479,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch release_mandatory_collection_resources_path(year: 2024)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -528,9 +528,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get new_collection_resource_path(year: 2025, log_type: "sales")
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -541,9 +541,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get new_collection_resource_path(year: 2025, log_type: "sales")
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -589,9 +589,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         post collection_resources_path, params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -602,9 +602,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         post collection_resources_path, params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
   end
@@ -722,9 +722,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get collection_resource_edit_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -735,9 +735,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get collection_resource_edit_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -794,9 +794,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch collection_resource_update_path(collection_resource), params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -807,9 +807,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         patch collection_resource_update_path(collection_resource), params: params
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
   end
@@ -831,9 +831,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get collection_resource_delete_confirmation_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -844,9 +844,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         get collection_resource_delete_confirmation_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -892,9 +892,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         delete collection_resource_delete_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
 
@@ -905,9 +905,9 @@ RSpec.describe CollectionResourcesController, type: :request do
         sign_in user
       end
 
-      it "returns page not found" do
+      it "returns page not authorised" do
         delete collection_resource_delete_path(collection_resource)
-        expect(response).to have_http_status(:not_found)
+        expect(response).to have_http_status(:unauthorized)
       end
     end