Read Next / Classifieds problem

I had to make an edit to the Read Next code.
Not all users have a thumb (verified address / tel no). This means that if they hit the Read Next link and the site tries to put them into a Classified thread, they get the error page telling them they can't read classifieds.
So...I have removed Classifieds from the Read Next for the moment, but I am working now to get a better solution in place which will cater for both types of user.