MissM,
IF you agree that BA need to save large amounts of money in order to be competitive....
I can hardly think of a better way of doing it, while inflicting as little pain upon individuals (you), than what has been imposed.
The only big loser here is BASSA, which has been completely bypassed, and THAT is why you are going to war with BA.
You can't go on strike over what BA might do in the future...
Your best defense is to be seen by BA as being competitively priced in the marketplace, and then there's simply no incentive to attack your T's & C's.
Willie doesn't care about how much each individual is paid - it's the overall cost of the department + its flexibility that concerns him.
The impositions achieve BA's desired cost without affecting your pay, is this not a win/win?
Regarding operational flexibility....
Pilots are rostered to agreements, but inevitably work to legal limits on the day.
It works. It's satisfying. It's very rare to meet anyone who wants to walk off a job half-done unless they absolutely have to.
It doesn't ruin your life, and if this is all it takes to get BA off your back I think it would be a price well worth paying.