SP is now 'retention pay' according to Air Manning. Certainly, removing it from those who PVR supports the argument.
Then, if you are 'fortunate' to find yourself in a ground tour, and your SP is cut, the MOD feels it no longer needs to retain you.
Q. Does this mean RoS no longer apply?
Anyway, it comes down to to how much of the nutella sandwich you can stomach before PVRing!