Current plan is to take 21 WSOs in to training each year for the next 5 years at least. Not sure how many are destined for GR4 but I'd guess about 40% say 8 a year. Now for my money that really ain't worth running a separate training course for. Much more cost effective to train 8 more pilots and send the bottom of each course to sit in the back for a tour or so while they get up to speed.
Directional consultancy is a dying profession.