Collbar, the RAF trained manpower establishment is screwed down as tight as a ducks ^rse. Only this year has it been approved to increase the number of fire fighters and regiment personnel (IIRC).
We continue to fight an intensive and lethal war from a wholly peacetime posture.
There will be no grounds for getting more ST slip crews as there is no proven need. (That is tongue firmly in cheek).
The need could be proven if flights were delayed and ultimately cancelled with crews adhering to published rest periods and were supported all the way up the stars. Unfortunately would YOU want to be the crew that turned round to a couple of hundred squaddies UK bound on R&R and said sorry, I need another 8 hours kip?
The press-on-its, peer or boss pressure, and sheer comradship will mean crews wil operate when they really should not.