To answer some of the above:
Balpa were neither consulted nor informed.
There appears to be no contractual breach here. If you know of one, let Balpa know and something will be done (but you clearly are not a member so............)
3 TOs in 90 can be in either seat.
CAA have to approve it.
SIM LVO trg is to be given (I'm now told!).
Why vent your spleen on this forum?? Use the company Intranet then maybe the people who dreamt up this idea will give you an answer.