Depends which side of Hadrians Wall you work on.
All very well for sorting out issues on your own doorstep that directly affect you but fighting the corner for your colleagues when you already have your deal in place doesn't seem like such a pressing issue.
In my experience advice from the relevant people has been less than helpful.
A mass resignation from BALPA is not entirely unlikely if more of the one deal for us and let them sort themsleves out whilst recommending they accept worse conditions (& pay eventually!!) continues.