This produces and interesting 'parallel universe' scenario.  If Lord Hill had not chosen to centralise TV listings when he regionalised the ITV system, a very good way of changing the listings magazines might have been to have instituted something like what Dickens already had done.

Each magazine would have identical layout, identical features and even identical stories.  But, each magazine could have retained its own name.  So The Viewer and Look Westward would survive.  As would Ulster's TV Post and HTV's TVWeekly.  In regions that had the TVTimes originally, new magazines could appear - Midland Montage for ATV?  From The North for Granada?  Chevron for YTV?  Well, perhaps not, but I'm sure you get the idea.