Sorry Banzai but you've got it wrong. CAP371 doesn't say you must be rested for Max FDP and it certainly doesn't say you must be rested for discretion. What it actually says is you must be rested for your next DUTY. Therefore, if a crew member believes they are reporting for a PMI then they rest for a PMI. Just because the FDP tables say you can do XX hours if you report at XXXX time doesn't mean that a crew member has to do that. If they pitch in for a rostered PMI flight and feel fatigued on the outbound sector they are perfectly in their rights to refuse to operate the return leg. Oh the joys of CAP371!