same case here...
I've done my FP1 back in Sep 2002 but haven't yet received any 2nd FP notice. I called the NCSC to ask them the same and the answer was very vague and wasn't anything that I already didn't know. I guess the notices aren't generated automatically at the end of 15 months.
There is no point in searching for logic to how this beheamoth works. While ultimately it will end, for now, just enjoy your free seats on this ride called uncertainity.