[support] Viewing pages not yet published but need to be viewed

I'm very stuck on a fairly simple thing, can't seem to find a solution. Would greatly appreciate some help please.

I have a Views block displaying on a Content Type page "review page". It shows all not published pages - for review and publication by the reviewer.

I have a Rule that when the Reviewer logs in, the Rules -> Page Redirects to the "review page". The review page shows list of page titles. All good so far. When I as Reviewer click on a title I get error message, " Access Denied - Not Authorised to View this page"

I note in Permissions that there is no option to view unpublished content. How can I grant permissions or access for the reviewer to inspect the content of each unpublished page?

Thanks in advance Roger