Something like the question posed in post 97 (2) was suggested to Angel Flight back in March when the CASA was putting their new rules on CSF in place.
Angel Flight replied that "We tried to institute a ‘duty pilot’ concept (CHIEF Pilot/CASA examiner etc) but could not because no insurer would cover that role"
Couldn't really see why a mentor could be an insurance problem. Maybe there is a CASA rule about mentors!!
Gliding Clubs have duty pilots and they are private OPS!