CC78,
The only Europe nightstops they have are LHR ones where you spend between 12 and 24hours in london between flights. Paris/Amsterdam/Zurich/Birmingham/Manchester etc are all LONG gone I am afraid. I dont even know if they still do Cork or Shannon nightstops, I fear these too are long gone.
As for the permancency I dont really know how this works, seems to be based on excellent reports from senior crew and pot luck!!!!