Yes. The payments have been made not only to police officers but to a wide range of public officials. So there are categories as well as police: military, health, government, prison and others. This suggests that payments were being made to public officials who were in all areas of public life.
I have said that the current assessment is that it reveals a network of corrupted officials. When I say "network", I don't necessarily mean -- and I don't mean -- that the officials are in contact with each other; more that the journalists had a network upon which to call at various strategic places across public life.
There also appears to have been a culture at the Sun of illegal payments, and systems have been created to facilitate those payments, whilst hiding the identity of the officials receiving the money. The emails indicate that payments to sources were openly referred to within the Sun, in which case the source is not named, but rather the category "public official" is identified, rather than the name.