Missed connections
welcome_stranger,
My understanding of J* policy regarding connections is that if you miss the connection, tough luck. They have quite clearly stated that they are a point-to-point carrier and that they do not provide connections for other J* flights. As for the recent "looking after" of J* passengers that missed their flight because a Q flight was delayed, I think they were trying to avoid more bad press over the cultural changes they are beinging into effect. If it had been Vigin, they wouldn't have cared (and nor should they).
All I can say is I wouldn't be booking two or more consecutive sectors with J*. You pay the cheap fare - don't expect the world.