SOSL - Yes I do indeed mean like Spec Aircrew. As alluded to by other posters perhaps this will be used as another manning lever; certainly the prospect of stagnant pay for rather a long time does not fill me with joy. Another bad joke in the long running comedy that is RAF Career Management.
I wonder how long this new system will survive contact with the real world and whether the Mainstream branch will be expected to cope with the churn of Elites/Executives thundering past on their path to glory? My experience in the past with such 'chosen ones' points to the fulfillment of my supposition.....