Thanks Wirbelstrum, a very informative response. It would seem that BA are as bad at planning these things as the rest of the industry.
If training capacity is really the limiting factor then surely the next stage after type rated pilots is experienced non-rated who would not require base training and possibly need less line training?
SSP's will require the most training, including touch and go's and possibly more sectors line training. Not what a stretched training department really needs.
Keep the information coming guys. Very helpful.