As has already been pointed out, NAPS was closed to new entrants years ago - many BA staff are already on BARP so are on a less generous pension scheme. APS was the Golden age and there were plenty of complaints about them from those on NAPS - now the same is happening all over again.
So why should those staff on BARP accept less good pay rises simply to fund NAPS? - I was in NAPS and even I could defend that.