Interesting thread, if a little clogged up with rubbish. The fact of the matter is that Errol isn't NOTAMed and while it is depicted as a parachuting site on charts, 90% of the time nothing's happening there - along with most other parachuting and some gliding sites in the area.
A NOTAM drawing attention to times of activity and contact frequencies would be a big help, as it's a little unreasonable to expect people to avoid the area for no reason.