NN / HF...
Prior to the last BA Pay Deal, Pensionable did equal Basic. There was then this "abatement" discount ~£4.5K.
With the Pay Deal, a separate Pensionable scale was introduced. It was lower than the SH payscale, and common to LH/MH/SH to:
1. Mean all were on a common scale
2. Avoid the Pension CAP limit for Max contributions
3. Allow for the fact that the new Pay Scales included previously non-pensionable elements.
In NAPS now, you still apply the Abatement to the Pensionable scale. With the proposed MPS scheme you do not...
Hope that helps...
NoD