To answer earlier questions re length of time to train users on PRS:-
I used to do some training for BA on PRS and found that with competant new recruits it should not ntake any longer than one and a half weeks to give them a crash course in the basic fundamentals of PRS what normally takes the most time is security passes and getting up their confidence alone on check-in.
Like with anything new it takes a while for people to get up their confidence to checkin the amounts of passengers in the time that BA are going to need them to!!!