I also remember an email from LL, the former Airbus fleet mgr. that said we could eat, read, watch movies etc. in First Class, but not sleep. If we wanted to sleep on the 345 we had to go to the BCRC.
I always sit in FC for anything but sleeping and have only had one new purser say anything to me about it. I just told him that if it ever came up to say that I insisted as PIC. That seemed to satisfy him. This is, after all the days of termination of pursers over the rest situation. You can't blame them for being too carefull.
Regards,
330 Man