I have actually managed to use the actual Portal document URL and add-on the Policy ID macro on the end and create a hyperlink out of it to put in the email notification. Works a treat and now goes direct to the document on the portal from the email. Example below if anyone needs it:
https://www.xxxxxxxxxx.com/portal/policy/document/%SECURITYPOLICY_ID%
This can now be used to notify users that a new document has been added by also using the Published Status as a dynamic status change.