A 12 hour sector, I guess 1 hour report, 30 minutes after FDP, = 13.5 hours, a time difference of 1 hour thus no extended rest required thus 13.5 hours would be the required rest and not minimum rest nor the 15 hours as declared at the start of this forum.
Some guys can be their own worst enemies, sure this is a knackering schedule but 'fatigue' can only be declared at the time and some guys are declaring fatigue months in advance for the operator to show to the CAA etc. that this is not 'actual' fatigue.