If there was a nonrev in BE, that person should have been told to swap seats with you if you wanted to move, but OPUPs normally are treated on board like paying BE passengers and not given lower priority on meal choice, etc., the way nonrevs are. If this was DUB, there would not have been a crew rest seat in BE if they needed the seats. (If a crew member has been allocated a normal non curtained rest seat, I think they could be asked to sway.) DUB seems to frequently have lots of OPUPs, even of kettles.