diff --git a/lib/config/wdtk-routes.rb b/lib/config/wdtk-routes.rb
index 38c45236..5c22a3ff 100644
--- a/lib/config/wdtk-routes.rb
+++ b/lib/config/wdtk-routes.rb
@@ -16,9 +16,12 @@
   get '/help/report-a-data-breach/thank-you' => 'help#report_a_data_breach_thank_you',
       as: :help_report_a_data_breach_thank_you
 
-  get "/help/ico-guidance-for-authorities" => redirect("https://ico.org.uk/media/for-organisations/documents/how-to-disclose-information-safely-removing-personal-data-from-information-requests-and-datasets/2013958/how-to-disclose-information-safely.pdf"),
+  get "/help/ico-guidance-for-authorities" => redirect("https://ico.org.uk/media/for-organisations/documents/2021/2618998/how-to-disclose-information-safely-20201224.pdf"),
       as: :ico_guidance
 
+  get "/help/microsoft-hidden-data" => redirect("http://support.microsoft.com/en-us/office/remove-hidden-data-and-personal-information-by-inspecting-documents-presentations-or-workbooks-356b7b5d-77af-44fe-a07f-9aa4d085966f#ID0EBBD=Excel"),
+      as: :excel_guidance      
+
   get "/help/ico-anonymisation-code" => redirect("https://ico.org.uk/media/1061/anonymisation-code.pdf"),
      as: :ico_anonymisation_code