Jto - sorry mate but you are wrong. PAS is not an engagement structure at all, but a distinct pay spine. Many assume it is an engagement structure and it does tend to be used as such by desk officers, but it is not.
And it didn't make it onto the presentation at all. If you are on PAS now with a gauranteed service to 55 then you remain on that. If promoted to Sqn Ldr, aftre 1 apr 15, then to age 60 (correction to my previous post as meant Sqn Ldr, not Wg Cdr for flying branch). So overall this probably works better for flying branches