So What does PPR Really Mean ?

[Eira]

I cannot speak from a small airstrip point of view, but certainly from a major airfield PPR is strictly enforced.
PPR at Major airfields is placed on because of various ground handling reasons usually rather than an ATC reason. For example lack of parking, runway and taxiway closures or maybe even the lack of fuel.
Lack of staff in ATC as well can have an impact .
Check your daily PIBs as well as your AIP if it says PPR ring up and check, you may be lucky and get a PPR slot