I'm not sure that FT story is any different from what's been said by the union for a day or two now, is it?
Actually, this Guardian story might shed some light:
British Airway's last chance to avoid costly strike and save £100m | Business | guardian.co.uk
I'm a touch surprised by the quoted spokesman's comments though. Not that they're necessarily wrong, just that it's the first miss-step in a while from BA
"Tony Woodley [joint general secretary] is not saying that he would recommend it [the proposal]. He is not saying that he would accept it. BA has been threatened with strikes for months. We are fed up with the uncertainty and we are not going to put up with it."