All the occupants of neighbouring property who were consulted on the planning application that is the subject of the appeal, together with those additional people who wrote individual letters of representation would be notified. 

Those who just made written representations on previous applications and not on the application that is the subject of the appeal would not be notified.

Also, those who just added their names to a petition (apart from the person who lead the petition); and those who just made verbal representations would not be directly notified.